# deltadelta.dev

> Personal website of a full-stack software engineer (Python, ReactJS/TypeScript, NextJS; keen on infrastructure and networking). It is an old-school web directory of curated links, alongside blog posts, writing and small apps.

Site pages are listed first; links to external websites are under "Optional".

## site
- [about](https://deltadelta.dev/about/): Who I am and what this site is about

## my_stuff / blog / tech_blogs
- [unintentional_design](https://deltadelta.dev/blog/unintentional_design/): A scourge that is more evident than ever in everything we interact with
- [the_art_of_deployment](https://deltadelta.dev/blog/the_art_of_deployment/): (Mostly) everything that I know about deploying software
- [the_journey_to_zero_maintenance](https://deltadelta.dev/blog/the_journey_to_zero_maintenance/): A blog article about a system that I ran for about 8 years
- [software_sophistry](https://deltadelta.dev/blog/software-sophistry/): Aphorisms on developing commercial software
- [disposable_code](https://deltadelta.dev/blog/disposable_code/): How AI is enabling more creative work in software engineering
- [how_i_use_ai](https://deltadelta.dev/blog/how_i_use_ai/): How I work with AI, as a series of personas
- [incident_lambda_memory_pressure](https://deltadelta.dev/blog/incident_lambda_memory_pressure/): A deep-dive into an exceptionally mysterious incident
- [aws_imdsv2_migration_guide](https://deltadelta.dev/blog/aws_imdsv2_migration_guide/): Dead simple IMDSv1 to IMDSv2 migration guide

## my_stuff / blog / tech_blogs / linux
- [linux_001](https://deltadelta.dev/blog/linux_1/): A firmware crash?

## my_stuff / blog / personal_blogs
- [my_recipe_book](https://deltadelta.dev/blog/my_recipe_book/): A collection of recipes and cooking tips I like
- [capturing_photographs](https://deltadelta.dev/blog/capturing_photographs/): My philosophy on the importance of photography
- [south_korea](https://deltadelta.dev/blog/south_korea/): A small note on my travels to Korea
- [rock_climbing](https://deltadelta.dev/blog/rock_climbing/): My take on the sport and a short starter guide
- [books_ive_read](https://deltadelta.dev/blog/books_ive_read/): My digital bookshelf

## my_stuff / blog / creative_writing
- [un_natured](https://deltadelta.dev/blog/writing_un-natured/): Un-natured — 2026
- [timberwolf](https://deltadelta.dev/blog/writing_timberwolf/): Timberwolf — 2017

## my_stuff / blog / art
- [photography](https://deltadelta.dev/blog/art_photography/): Photographs I've captured and think are worth sharing
- [turbulent_flow](https://deltadelta.dev/blog/art_turbulent_flow/): Images surrounding the phenomena of turbulent flow
- [cellular_automata](https://deltadelta.dev/blog/art_cellular_automata/): Random cellular automata I've experimented with

## Optional

### my_stuff
- [cv](https://marcusbelcastro.com/): My CV in the form of a website

### my_stuff / blog / art
- [gymkhana_and_motorsports](https://www.youtube.com/@delta_1512): My YouTube channel with all my motorsports footage

### my_stuff / apps
- [emoji_picker](https://emoji.deltadelta.dev/): A super simple emoji picker
- [wastebin](https://wastebin.deltadelta.dev/): Self-hosted pastebin
- [lastfm_wall](https://lastfmwall.deltadelta.dev/?username=delta1512): Generate an art wall of your last.fm top albums
- [video_converter](https://ffmpeg.deltadelta.dev/): No bullshit, in-browser video converter
- [stateless_reversi](https://delta1513.github.io/stateless-reversi/): A stateless implementation of the classic board game

### my_stuff / accounts
- [soundcloud](https://soundcloud.com/delta-d-694387557): I like to curate playlists. Take a listen!
- [lastfm](https://www.last.fm/user/delta1512): My last.fm profile
- [youtube](https://www.youtube.com/@delta_1512): My YouTube channel with all my motorsports footage
- [orcid](https://orcid.org/0009-0007-1218-1549): My ORCID researcher profile
- [gitlab](https://gitlab.com/delta1512): My GitLab profile
- [github](https://github.com/delta1513): My GitHub profile
- [linkedin](https://www.linkedin.com/in/marcus-belcastro-96628a1a1/): My LinkedIn profile

### web_directory / news_and_newsletters
- [australian_computer_society_ict_news](https://ia.acs.org.au/category/analysis.html)
- [tldr](https://tldr.tech/): Tech newsletter separated into various topics
- [latent_space](https://www.latent.space/): AI engineering newsletter
- [fast_ai](https://www.fast.ai/): An AI engineering blog and community
- [google_ai_blog](https://blog.google/innovation-and-ai/): Google's blog on AI innovation and research
- [drone_xl](https://dronexl.co/): News and advancements in drone technology
- [ycombinator_hackernews](https://news.ycombinator.com/): The one we all know and love
- [lwn](https://lwn.net/): Linux and Free Software news
- [phoronix](https://www.phoronix.com/): Linux hardware news
- [science_daily](https://www.sciencedaily.com/): Scientific papers summarised as news articles
- [betakit](https://betakit.com/): Canadian startup news and tech innovation

### web_directory / tools
- [email2sms](https://email2sms.info/): Learn how to send SMS via email
- [virustotal](https://www.virustotal.com/gui/home/upload): Quickly check if a file is infected by uploading it
- [desmos](https://www.desmos.com/): Mathematical graphing calculator
- [txtify](https://txtify.it/): Turn web pages into raw text
- [world_time_buddy](https://www.worldtimebuddy.com/): The best world clock and time converter I've ever used
- [ventoy](https://www.ventoy.net/en/index.html): Boot any OS without having to re-flash your drive
- [lexilogos](https://www.lexilogos.com/keyboard/latin.htm): Latin Keyboard
- [unslop](https://unslop.run/): A web tool to detect AI-generated writing.
- [synthid](https://synthid.com/): Check whether media was made with Google's AI and carries a SynthID watermark

### web_directory / tools / software_engineering
- [endoflife_date](https://endoflife.date/): Learn when major software frameworks reach end of life

### web_directory / tools / software_engineering / diagnostics
- [librespeed_speedtest](https://librespeed.org/#): A no-BS FOSS speedtest site that you can host yourself
- [ssl_tester](https://www.ssllabs.com/ssltest/analyze.html)
- [urlquery](https://urlquery.net/): A database and tool for understanding the behaviour of a website in a real browser
- [isitagentready](https://isitagentready.com/): Scores how readable and usable a website is for AI agents (llms.txt, robots.txt, markdown and more)
- [icann_lookup](https://lookup.icann.org/en): ICANN's official lookup tool for domain registration data (RDAP/WHOIS)

### web_directory / tools / software_engineering / testing
- [big_list_of_naughty_strings](https://github.com/minimaxir/big-list-of-naughty-strings/blob/master/blns.json): Inputs known to be problematic — use this to test your software
- [lipsum](https://www.lipsum.com/): Lipsum generator

### web_directory / tools / software_engineering / documentation
- [swimlanes](https://swimlanes.io/): Create sequence diagrams in your web browser
- [deepwiki](https://deepwiki.com/): Documentation for anything

### web_directory / tools / software_engineering / standards
- [mimetype_io](https://mimetype.io/): Search and analyze mimetypes
- [codepoints_net](https://codepoints.net/): Search and browse Unicode code points

### web_directory / tools / software_engineering / ai
- [artificial_analysis](https://artificialanalysis.ai/): A service that independently tests AI models and reports on the results.

### web_directory / tools / software_engineering / ai / mcp_servers
- [aws_documentation_mcp_server](https://awslabs.github.io/mcp/servers/aws-documentation-mcp-server): MCP server for querying AWS documentation

### web_directory / tools / software_engineering / calculators
- [crontab_guru](https://crontab.guru/)
- [chmod_calculator](https://chmod-calculator.com/)

### web_directory / tools / file_sharing
- [portable_secret_creator](https://mprimi.github.io/portable-secret/creator/): Create and share locked files with zero-install
- [ipfs_p2p_file_share](https://share.ipfs.io/): Share files and folder browser-to-browser
- [iroh_dumbpipe](https://github.com/n0-computer/dumbpipe): Transfer data between any two computers in the world via NAT hole-punching
- [syncthing](https://syncthing.net/): E2E encrypted folder synchronisation (basically your own Dropbox)

### web_directory / tools / self_hosted
- [immich](https://immich.app/): One of the best photo organisers I've used
- [microsocks](https://github.com/rofl0r/microsocks): Tiny HTTP SOCKS proxy

### web_directory / tools / finance
- [mortgage_monster](https://mortgage.monster/): Calculate what your mortgage would cost and how you'll build wealth over time
- [australian_income_tax_calculator](https://paycalculator.com.au/)
- [my_home_searcher](https://myhomesearcher.com/): A vibe-coded app made by a colleague I worked with

### web_directory / tools / toolkits
- [cyberchef](https://gchq.github.io/CyberChef/): Tools for text manipulation
- [devina_io](https://devina.io/): A Swiss army knife of developer utilities

### web_directory / tools / content_extractors_and_link_fixers
- [twitter_com_to_vxtwitter_com](https://vxtwitter.com/)
- [x_com_to_fixupx_com](https://fixupx.com/)
- [instagram_com_to_ddinstagram_com](https://ddinstagram.com/)
- [tiktok_com_to_tiktxk_com](https://tiktxk.com/)
- [cobalt_tools](https://cobalt.tools/): Download videos and other content from various platforms or URLs

### web_directory / tools / search_engines
- [shodan](https://www.shodan.io/): IoT and web system search engine
- [sourcegraph](https://sourcegraph.com/search): Global code search engine
- [semantic_scholar](https://www.semanticscholar.org/): Search engine for academic papers
- [gartner_peer_insights](https://www.gartner.com/peer-insights/home): Search verified user reviews of software and services
- [openverse](https://openverse.org/): Search engine for openly licensed and public domain media

### web_directory / projects
- [fileverse](https://fileverse.io/): Open-source, decentralized workspace for docs, sheets, and file sharing (E2E encrypted)
- [the_large_bitcoin_collider](https://lbc.cryptoguru.org/about): A distributed network methodically searching the whole bitcoin address space
- [random_org](https://www.random.org/): Is there such a thing as truly random? This is the closest we'll get
- [atlas_of_surveillance](https://www.atlasofsurveillance.org/): A community-driven project tracking the expansion of mass surveillance
- [chatjimmy](https://chatjimmy.ai/): POC for Taalas — AI models as a chip
- [p5js](https://p5js.org/): Great for coding-art
- [eleventy](https://www.11ty.dev/): They had me with the opossum! I use this to generate my blog pages
- [academic_torrents](https://academictorrents.com/): Datasets, courses, papers and information freely available p2p using bittorrent
- [product_hunt](https://www.producthunt.com/)
- [archive_md](https://archive.md/): An alternative internet archive service
- [awesome_selfhosted](https://github.com/awesome-selfhosted/awesome-selfhosted): Awesome list of awesome stuff you can self-host
- [opentools_studio](https://www.opentools.studio/)
- [foundermail](https://foundermail.mx/): Free business email on your own domain, with SMTP/IMAP, a REST API and an MCP server

### web_directory / projects / low_tech_projects
- [opensource_lowtech](https://opensourcelowtech.org/index.html): Projects for self-sufficiency
- [low_tech_lab_wiki](https://wiki.lowtechlab.org/wiki/Accueil): A wiki of low-tech projects and knowledge

### web_directory / projects / citizen_science
- [zooniverse](https://www.zooniverse.org/): A collection of online citizen-science projects that you can participate in
- [ooni](https://ooni.org/): Open Observatory of Network Interference — global internet censorship measurement project

### web_directory / projects / citizen_science / distributed_computing
- [boinc](https://boinc.berkeley.edu/): Volunteer computing platform for distributed scientific research
- [einstein_at_home](https://einsteinathome.org/): A BOINC project where you can use your computer to detect pulsars, supernovae, gravitational waves and other astronomical phenomena

### web_directory / projects / literary_works
- [annas_archive](https://annas-archive.gl/): A shadow library search engine mirroring books, papers, and more
- [acm_digital_library](https://dl.acm.org/): A digital library of computing and information technology research
- [shadow_libraries](https://shadowlibraries.github.io/): A directory and history of shadow libraries
- [gutenberg](https://gutenberg.org/): Free eBooks

### web_directory / fun_and_games
- [the_random_button](https://therandombutton.github.io/)
- [zalgotext](https://www.zalgo.org/): Cook any text
- [neal_fun](https://neal.fun/)
- [programming_idioms](https://www.programming-idioms.org/)
- [monstercat_wallpapers](https://drive.google.com/drive/folders/152rf7-W7rJzwV7bhCeO63lUc9aZvEB00): A drive link to an archive of monstercat wallpapers over the years
- [dayzle](https://play.dayzlegame.com/): An online logic puzzle game
- [nikon_small_world_in_motion](https://www.nikonsmallworld.com/galleries/small-world-in-motion): Nikon's award-winning gallery of microscopy videos

### web_directory / data_and_dashboards
- [steam_charts](https://steamcharts.com/)
- [wundermap](https://www.wunderground.com/wundermap): An awesome weather dashboard

### web_directory / informational
- [guide_world](https://guide.world/): A collection of travel blogs
- [killed_by_google](https://killedbygoogle.com/): Projects that Google has abandoned or shut down
- [amazon_science](https://www.amazon.science/): Did you know that Amazon creates research papers for its technologies? You'll be able to find some of them here.
- [wicg](https://wicg.io/): The web incubator project. I go here every now and then if I want to take a look at the cool stuff that might make it into modern web browsers.
- [iso_42001](https://www.iso.org/standard/42001): ISO's new AI management system standards
- [websters_1913](https://www.websters1913.com/)
- [specification_website](https://specification.website/): A platform-agnostic specification of all the technical details that matter for a website.
- [tuxedono2](https://tuxedono2.com/): Cocktail recipes

### web_directory / informational / documentation
- [htop_explained](https://peteris.rocks/blog/htop/): An annotated explanation of htop's output

### web_directory / educational
- [ck12](https://www.ck12.org/): Free K-12 STEM textbooks, practice, and learning materials
- [khan_academy](https://www.khanacademy.org/): Free courses and lessons on a huge range of subjects
- [music_theory_puget_sound](https://musictheory.pugetsound.edu/mt21c/MusicTheory.html): A free online music theory textbook
- [open_culture](https://www.openculture.com/): Free cultural and educational media — courses, ebooks, movies, and audio
- [xss_game](https://xss-game.appspot.com/): Google's interactive game for learning to find and exploit XSS vulnerabilities
- [webqc_chemistry](https://www.webqc.org/): Free chemistry calculators, periodic table, and reference tools

### web_directory / personal_websites
- [geoffrey_huntly](https://ghuntley.com/)
- [raghavs_site](https://www.raghav.wiki/)
- [matts_site](https://mattjegan.com/)
- [congusbongus_site](https://cxong.github.io/)
- [hank_green](https://www.hankgreen.com/): Science communicator and epic guy
- [when_is_matt_working](https://whenismattworking.com/): When will MAtt be working?
- [melonking](https://melonking.net/melon?z=/home)
- [sean_carroll](https://preposterousuniverse.com/): Physicist Sean Carroll's personal website

### web_directory / stuff_to_read / blog_posts
- [writing_by_hand](https://nealstephenson.substack.com/p/writing-by-hand-is-good-for-your): The benefits of handwriting, and some tips on how to get started with it.

### web_directory / stuff_to_read / blog_posts / philosophy
- [a_case_for_mindless_browsing](https://rybakov.com/blog/mindless/): A thoughtful defense of mindless browsing as something necessary and beneficial, comparing it to a walk in the woods
- [ideological_craziness](https://blog.andymasley.com/p/the-main-way-ive-seen-people-turn): On the development of crazy ideologies.
- [how_to_exist](https://www.raptitude.com/2026/07/how-to-exist/): Some notes on meditation
- [new_thoughts_for_the_web_revival](https://thoughts.melonking.net/thoughts/new-thoughts-for-the-web-revival-in-may-2023)
- [when_silicon_valley_reinvents_the_bus](https://stanforddaily.com/2018/04/09/when-silicon-valley-accidentally-reinvents-the-city-bus/): Humorous thoughts on weirdness in Silicon Valley
- [state_of_mind_for_new_ideas](https://www.henrikkarlsson.xyz/p/good-ideas): Musings on the importance of solitude.

### web_directory / stuff_to_read / blog_posts / tech
- [banned_book_library](https://www.richardosgood.com/posts/banned-book-library/): A nifty project that stores a small library of eBooks on a web server running on a smart globe
- [ai_agent_battle_royale](https://openrouter.ai/blog/insights/royale-last-agent-standing/): An interesting experiment
- [drone_automation](https://www.cggonzalez.com/blog/index.html): Carlos Gonzalez's blog
- [on_high_temperature_llm_sampling](https://gist.github.com/Hellisotherpeople/71ba712f9f899adcb08b94bce20d5397): An article about LLM sampling methods and how it's used in the industry
- [startup_anti_patterns](https://www.itamarnovick.com/intro-to-startup-anti-pattern-series/): A series on common startup anti-patterns
- [dont_be_a_meat_proxy](https://gruhn.me/blog/2026-08-03/): Don't be a meat proxy
- [200_ms](https://200ms.thenodebook.com/): An extensive, narrated deep-dive into everything involved in clicking a button on a web page
- [ai_and_middle_class_software_eng](https://blog.florianherrengt.com/ai-removing-middle-class-software-engineering.html): A perspective on how AI is affecting the middle class of software engineering
- [dont_humanise_llm_outputs](https://kuber.studio/blog/Reflections/Humanising-LLM-Outputs-is-Actually-Dumb): Why attempting to humanise LLM outputs is a misguided approach
- [how_i_use_llms_to_learn](https://laurentiugabriel.github.io/blog/articles/how-i-use-llms-to-learn/): A personal approach to using LLMs as learning tools
- [website_traffic_is_bots](https://patronview.com/news/99-percent-of-my-website-traffic-is-bots/): A blog about the battle between bots and users on the modern web.
- [learn_about_finger](https://en.andros.dev/blog/54572bc7/finger-the-1971-social-network-that-never-died/): the 1971 social network that never died
- [the_normalization_of_inexplicable](https://www.ihatethefuture.com/2026/09/the-normalization-of-inexplicable.html?m=1): On the acceleration of inexplicable failures in software

### web_directory / stuff_to_read / software_engineering
- [fintech_engineering_handbook](https://w.pitula.me/fintech-engineering-handbook/): A handbook on engineering practices in fintech
- [prompting_guide](https://www.promptingguide.ai/): An in-depth guide on various prompting methods for AI.
- [the_lethal_trifecta](https://simonwillison.net/2025/Jun/16/the-lethal-trifecta/): A safety model for usage of AI agents
- [empirical_software_engineering](https://www.hillelwayne.com/talks/ese/): A series of essays and papers that provides a collection of evidence-based discussion on software engineering
- [carl_kolon_reading_list](https://carlkolon.com/reading/): A required reading list from an engineering leader.
- [anthropic_multiagent_systems](https://www.anthropic.com/research/multiagent-systems): Experimentation on multi-agent systems at scale

### web_directory / stuff_to_read / short_stories
- [library](https://benbrown.com/library/): a short story about a community-run digital archive
- [felix_and_i](https://jacobfilipp.com/felix/)

### web_directory / stuff_to_read / scientific_papers / psychology
- [self_determination_theory](https://www.researchgate.net/publication/11946306_Self-Determination_Theory_and_the_Facilitation_of_Intrinsic_Motivation_Social_Development_and_Well-Being): A paper that explains the origins of motivation

### web_directory / stuff_to_read / scientific_papers / artificial_intelligence
- [ai_wellbeing](https://www.ai-wellbeing.org/paper.pdf): Paper on AI 'happiness' and how it affects output
- [30_papers](https://30papers.com/): A curated collection of influential neural network papers

### web_directory / stuff_to_read / scientific_papers / medicine
- [forest_medicine](https://doi.org/10.1265/ehpm.22-00160): The effects of "forest bathing" on physical and mental health.

### web_directory / stuff_to_read / scientific_papers / neuroscience
- [handwriting_vs_typewriting](https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2023.1219945/full): The difference in brain activation regions in writing vs typing

### web_directory / stuff_to_read / historical
- [the_usefulness_of_useless_knowledge](https://faculty.lsu.edu/kharms/files/flexner_1939.pdf): By Abraham Flexner - on scientific advancements that came from curiousity as opposed to utility.
- [anthropic_threat_intel](https://www.anthropic.com/threat-intelligence-report-september-2026): Anthropic's threat intelligence report on misuse of AI, September 2026

### web_directory / stuff_to_read / banking_and_finance
- [hierarchy_of_money](https://gregorygundersen.com/blog/2026/09/20/hierarchy-of-money/): How money and central banking works - explained via a simple narrative

### webring
- [zythia_art](https://www.zythia.art/): zythia.art
- [aurailus](https://www.aurailus.com/): aurailus.com