- Art
- Clankers
- Coffee
- Electronics
- Fact-checking
- GameDev
- Gaming
- Informatics
- Infosec
- IRC
- Mathematics
- Music
- Otaku
- Philately
- RSS
- Science
- SWE
- TeX
- Unix
- VCS
- Vim
- WebDev
- 日本語
- misc.
- ---
- Webcomics
Art
- Animal Photo Art References Search by x6ud
- Aphrite PoseSearch
- Art Models 360
- Height Comparison
- JustSketchMe -- character posing
- Line of Action
- Perspective Tools
- Pose Search by x6ud
- POSEMANIACS
- Quickposes
- Settei Dreams -- collection of anime model sheets
- Shading Reference
- Grafikowanie
- How to Draw Manga (2009) by Mark Crilley
- r/SketchDaily
- Scratchapixel -- book about computer graphics
- się rysuje
Clankers
- CommitStrip: A very comprehensive and precise spec
- R. U. R. -- Karel Čapek; WolneLektury.pl
Coffee
Electronics
- Circuit Simulator Applet
- Czarna lista zasilaczy i Renomowane marki zasilaczy
- Identiconn - Connector Identification Utility -- service from The Electronic Connector Book
- retrokolekcja.pl -- muzeum polskich półprzewodników i elementów hybrydowych
- Snaptron's design guide -- engineering handbook for metal dome switch design
Fact-checking
GameDev
- gbdev
- NA » NES Programming
- OpenGameArt.org -- free, legal art for Open Source game projects
- Vintage BASIC
Gaming
- Architecture of Consoles by Rodrigo Copetti
- Atarimania
- Backwards Compatibilty Chart -- check which game systems are backward compatible
- C64 Power
- ConsoleMods Wiki
- Consolevariations.com
- DoesItPlay? -- reviews testing games working offline
- Electronic Handheld Game Museum
- Game Verifying
- Hidden Palace -- community dedicated to the preservation of video game development media
- LCDMOD
- Legends of Localization -- look at video game translation and how games change during the translation process
- Libregamewiki
- OldGames.sk
- Open Source Game Clones
- OpenRetro Game Database
- ProtonDB
- Retro Redrawn -- pixel-art remakes and demakes of game graphics
- Snappy Driver Installer Origin -- portable driver installation and update tool (for old Windows)
- Steam Calculator
- The SEGA Hardware Database
- Unseen64 -- cancelled video games & their lost media
- Video Game Console Library
- Zapach papieru -- strona fanów prasy o grach
- Aminet -- set of interconnected WWW and FTP servers hosting freely distributable Amiga software
- Big Book of Amiga Hardware
- Everything Amiga
- Lemon Amiga
- PPA -- Polski Portal Amigowy
- The Amiga Museum
Informatics
- Algorithmica
- An Interactive Introduction to Fourier Transforms
- Artificial Life Portal -- collection of interesting projects at the intersection of computer science, biology, physics, and art
- Big-O Algorithm Complexity Cheat Sheet (Know Thy Complexities!)
- Computer Science Field Guide
- Dennis Ritchie Thesis - And the Typewriting Devices in the 1960s
- Oscar Forner - Sorting algorithms
- Teach Yourself Computer Science
- Teach Yourself Programming in Ten Years
- The Problem with Time & Timezones
- Turing machine visualization
Infosec
- AnarSec
- Electronic Frontier Foundation
- FilterLists
- Forensics Wiki
- Privacy Guides
- Public Route Servers
- Surveillance Self-Defense by EFF
- AbuseIPDB
- Browserleaks
- Cover Your Tracks by EFF
- DNS leak test
- Have I Been Pwned
- Hybrid Analysis
- ipleak.net
- MX Lookup Tool
- PhishTank
- Shodan
- VirusTotal
- r/computerforensics
- r/cybersecurity
- r/europrivacy
- r/hacking
- r/Infosec
- r/netsec
- r/opsec
- r/privacy
- r/uBlockOrigin
IRC
- ircdocs.horse -- information and documentation about the IRC protocol
- IRChelp.org
- netsplit.de -- IRC search engine
- Email is Easy -- Everyone knows what an email address is, right?
- ImprovMX -- email forwarding, email aliases for your domain name.
- MARC: Mailing list ARChives
- Use plain text email
Mathematics
- dCode -- collection of over 800 tools to help solve games, riddles, ciphers, mathematics, puzzles, etc.
- ProofWiki
- Rook Polynomials (Darryl K. Nester, Bluffton University)
- Squares in Squares
- The On-Line Encyclopedia of Integer Sequences (OEIS)
Music
- AHA Music -- song finder
- Chip Player JS
- keygenmusic.tk
- Oscilloscope Music
- Pixeltune -- online MIDI and video game music (VGM) player
Otaku
Philately
- EXPONET -- virtual international philatelic exhibition
- Katalog Znaków Pocztowych
- Stemplowanie i kasowanie, czyli o pieczątkach w filatelistyce
- World Stamp Catalogues
RSS
- Feed Creator
- MangaDex Feed Generator
- Open RSS
- PolitePaul
- RSS Advisory Board
- RSS-Bridge/rss-bridge
- Thirdplace Discovery
- YouTube playlist prefixes
Science
- Angry Reviewer -- academic style corrector for scientific writing
- CiteThis
- Heavens-Above -- satellite predictions and other astronomical data customised for your location
- HyperPhysics
- If the Moon Were Only 1 Pixel -- tediously accurate map of the solar system
- Map of Biology
- Map of Chemistry
- Map of Computer Science
- Map of Mathematics
- Map of Physics
- Papers We Love
- The IUPAC Compendium of Chemical Terminology
- Zenodo -- open-access research repository operated by CERN
SWE
- An Illustrated Guide to IPsec
- Choose an open source license
- Colobot -- educational game where you can program bots to find a new planet to live and survive
- CppQuiz
- GNU Assembler Examples
- GoF design patterns quiz -- recognize pattern based on UML diagram (and the intent)
- How can I handle command-line options and arguments in my script easily?
- IntroARM
- Jargon File Resources
- Keep a Changelog
- Langserver.org
- Learning COBOL: A Journey for the Modern Programmer
- Manifesto for Software Craftsmanship
- nand2tetris
- NandGame -- build a computer from scratch
- NASM Assembly Language Tutorials - asmtutor.com
- OSHub
- PlantText UML Editor
- PlantUML
- Quick C++ Benchmarks
- Refactoring.Guru
- regex101
- Regular-Expressions.info
- search C++ draft
- Semantic Versioning
- SPDX -- Software Package Data Exchange
- SQLBolt -- series of interactive lessons and exercises designed for learning SQL right in browser
- Two-Bit History
- WG21.link - Index -- index of C++ papers
- 500 Mile Email -- curated list of absurd software bug stories
- Internet Explorer is EVIL!
- The Codeless Code
- Wat -- few examples of weird quirks of Ruby and JS
- ZeroVer: 0-based Versioning
- FunRetrospectives
- Retromat -- Inspiration and plans for (agile) retrospectives
- Retrospective Wiki
TeX
- CTAN -- The Comprehensive TeX Archive Network
- Detexify -- LaTeX handwritten symbol recognition
- TeX Live documentation
- TeXdoc Online
Unix
- Apps in AppImage format - AppImages
- Are We Sixel Yet?
- Chmod Calculator
- crontab guru -- simple editor for cron schedule expressions
- Distrochooser
- DistroSea
- dockur/windows -- Windows inside a Docker container
- Haifux - The Haifa Linux club
- Help! Linux ate my RAM!
- Linux Font Equivalents to Popular Web Typefaces
- Linux Journey
- NO_COLOR -- disabling ANSI color output by default
- OpenPrinting
- POSIX - Shell Command Language - Parameter Expansion
- POSIX Shell Utilities
- SDF Public Access UNIX System
- The Grymoire
- The Open Group Base Specifications Issue 7, 2018 edition - Environment Variables
VCS
- Conventional Commits
- Dangit, Git!?!
- git rebase in depth
- How do I migrate an SVN repository with history to a new Git repository?
- Learn to use email with git!
- Use .config to store your project configs
Vim
- An incomplete history of the QED Text Editor
- Big Pile of Vim-like
- Dr Chip's Vim Page
- How to Do 90% of What Plugins Do (With Just Vim)
- idiomatic vimrc by romainl
- Learn Vim the Smart Way
- Learn Vimscript the Hard Way
- OpenVim - an interactive Vim tutorial online
- romainl/vim-gists.md
- Seven habits of effective text editing by Bram Moolenaar
- Some Facts About Vim · JetBrains/ideavim Wiki
- The Viminator
- Vi and Vim Stack Exchange
- Vim - Curated learning resources
- VIM Adventures
- Vim Awesome
- Vim Kōans and The Dharma of Vi
- Vim Quiz
- Vim Tips Wiki
- Vim.org - official Vim website
- Vimcasts
- VimGolf
- vimrctips of r/vim
- Vimways
- Why do Vim experts prefer buffers over tabs?
- Your problem with Vim is that you don't grok vi
WebDev
- 404PageFound -- active vintage websites, old webpages and web 1.0
- CSS Gradient -- generator of CSS rule with gradient background
- Flexbox Froggy -- game for learning CSS flexbox
- HTMLcat -- notes on tricks in HTML/CSS/JS
- Modern Motherfucking Website
- Neocities
- OldWeb.Today
- SVGOMG -- web GUI for SVGO (SVG optimizer)
- The Best Motherfucking Website
- The Retro Web
- The Ultimate Oldschool PC Font Pack
- TLD-List -- compare prices of all Top-Level Domains
- Untrusted -- JavaScript adventure game
- W3C - Validators and tools
日本語
- Animelon -- learn Japanese while watching anime with subtitles
- Hiragana Quiz
- Kanshudo
- kitsunekko - Japanese subtitles
- Real Kana
- Real Kanji
- Satori Reader
- WaniKani
- 青空文庫 -- classic Japanese novels
misc.
- ASCIIFlow
- AutoEq
- Diagon -- interactive ASCII art diagram collection
- Down For Everyone Or Just Me
- Electronic Texts of H.P. Lovecraft's Works
- ELMak's Remote Control Search
- Floor796 -- animated scene showing lives of various characters on the 796th floor of a huge space station
- gifcap
- GraphHopper Maps
- Help Vampires: A Spotter’s Guide
- How To Ask Questions The Smart Way
- Hyrum's Law
- I downvoted because...
- LOW-TECH MAGAZINE
- PCjs Machines
- PDF24 Tools
- playlist.tools -- reverse YouTube Playlists and more
- Power Thesaurus
- SailRabbit -- Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) Calculator
- Spurious Correlations
- Squiglink -- IEM frequency response database
- Tables Generator
- Terms of Service; Didn't Read
- Text to ASCII Art Generator (TAAG) -- (nice fonts: ANSI Shadow, Broadway KB, Mini)
- Textcraft -- text & logo maker - Minecraft, 8-bit styles and more
- Textik -- ASCII diagrams editor
- The Virtual OS Museum
- userChrome.css for Customizing Firefox
- Word Cloud Generator
---
Webcomics
- Arlokk the Atrocious
- Bluechair
- Cassandra Comics
- Catana Comics
- CommitStrip
- Consolia
- Cyanide & Happiness
- Doodle for Food
- Elf Comic
- Extra Fabulous
- Future Wife
- Gabital
- Garfield & Friends
- Heart and Brain
- How to be a Mind Reaver
- KOPS: Komiks o Polskich Superbohaterach
- Last Place Comics
- Litterbox Comics
- Loading Artist
- lunarbaboon
- Mimi
- Monkeyuser
- Mr. Lovenstein
- My Co-worker is an Eldritch X!
- Nerf NOW!!
- Poorly Drawn Lines
- Public U. Art Club
- RandoWis
- RaphComic
- Safely Endangered
- Sandra and Woo
- Sarah's Scribbles
- Saturday Morning Breakfast Cereal
- Shen Comix
- Slack Wyrm
- SoggyCardboard
- Swords
- The Boy From Venus
- The GaMERCaT
- they can talk
- Things in Squares
- War and Peas
- Whomp!
- xkcd
- АтМосФерА
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