Links
A collection of recommended links. Parents are liable for their children.
Mnemonics / Learning
- MemoryOS - App for Memory Palaces
- Memrise - Now App/Website for learning languages, prev for all stuff (hopefully community topics might return)
- Anki - Spaced repetition flashcard app
- Language Tutors - Platforms to find language tutors
- I Will Teach You A Language - Language learning podcast/course by Olly Richards
- Fluent in 3 Months - Language course for getting fluent in 3 months
- Lumosity Brain Training - Brain Training App (science questionable, but doesn't hurt)
- LingQ - Learn languages from additional video sources
- Language Mentoring - Language learning coaching by Lýdia Machová
- Chegg - Homework help and textbook solutions
- Art of Memory Forum - THE forum for memory training and resources
- Numzi - Similar to Major System but website seems broken
- IAM (International Association of Memory) - Official memory sports organization
- Human Benchmark - Test your cognitive abilities (reaction time, memory, etc.)
- Memocamp - Memory training and competition platform
- Memory League - Competitive memory training platform
- Master of Memory - by Timothy Moser (Mnemonic Podcast)
- Magnetic Memory Method - Memory palace course by Anthony Metivier
- Everest Memory - Memory Courses
- Ron White Training - Memory Courses
- Likanas Publishing - Publisher of Esels Welt (Book recommendation)
- Major System - Mnemonic system for memorizing numbers
- SuperMemo Guru - Piotr Wozniak, inventor of spaced repetition
- SuperMemo Wiki - His extensive knowledge base
- Learning How to Learn - Barbara Oakley's free course on effective learning
- Gwern.net - Rationalist, extensive spaced repetition research
- Memory Sports - World Memory Championships
- Learn Craft Spanish - Spanish learning course by Timothy Moser
- Zettelkasten - Note-taking method by Niklas Luhmann
- Niklas Luhmann Archive - The original Zettelkasten, digitized
- LessWrong: Note-taking - Rationalist takes on knowledge management
- Augmenting Human Intellect - Doug Engelbart's foundational framework
- Harry Lorayne - (RIP) Magician and Yoda of memory training
- RemNote - Note-taking with built-in spaced repetition
- Orbit - Spaced repetition embedded in articles by Andy Matuschak
- Tatoeba - Multilingual sentence corpus
- Readlang - Read in foreign languages with translation
Science
- All The Sky - Constellations - Photos and info on all 88 constellations
- NASA Astronomy Picture of the Day - Daily space image with explanation
- LessWrong - Rationalist Wiki/Site from the HPMOR guy
- GreaterWrong - Alternative frontend
- Ray Peat - Biologist's alternative health research
- Bioenergetic Life - Ray Peat community and resources
- Recipeats - Ray Peat inspired recipes
- Miles Mathis - Alternative physics and science writer
- Fourmilab Gravitation - Physics simulations by John Walker
- arXiv - Scientific preprints
- Category Theory for Programmers - Free book by Bartosz Milewski
- Fermat's Library - Annotated famous papers
- Complexity Explorer - Free courses from Santa Fe Institute
- PhET Simulations - Free interactive science simulations from CU Boulder
- NASA Technical Reports - Free access to NASA research
- Serious Eats - Science-based cooking, The Food Lab by Kenji López-Alt
- Quantum Country - Quantum computing with built-in spaced repetition
- Navigation - Celestial, marine, and traditional wayfinding
- NavList - Community for celestial navigation enthusiasts
- Celestial Navigation Net - Tutorials and resources
- Starpath - Courses on celestial and marine navigation
- Nautical Almanac - Nautical almanac and sextant resources
- GPS.gov - Official US GPS information
- Silva - Compass use tutorials
- The Natural Navigator - Tristan Gooley on wayfinding without instruments
- Sabine Hossenfelder - Physicist's blog, honest takes on physics hype
- John Preskill's Notes - Caltech quantum computation lecture notes
- HyperPhysics - Georgia State's physics encyclopedia with concept maps
- The Feynman Lectures - Classic physics lectures, free online
- Fooled by Randomness - Nassim Taleb's website on risk and probability
- Metaculus - Forecasting and prediction platform
- Meaningness - David Chapman on meaning, philosophy, and meta-rationality
- Distill - Clear, interactive ML research explanations (inactive but archive is gold)
- Encyclopedia of Triangle Centers - Every known triangle center, delightfully niche
- OEIS Wiki - Encyclopedia of Integer Sequences Wiki, beyond the main site
- Putanumonit - Jacob Falkovich, rationalist dating advice and life optimization
- Slime Mold Time Mold - Obesity research, contrarian science
- FoundMyFitness - Rhonda Patrick's health research
- Examine - Evidence-based supplement and nutrition info
- Circadian - Circadian rhythm research
- Game Theory
- Nicky Case - Interactive explorable explanations
- The Evolution of Trust - Prisoner's dilemma masterpiece
- Parable of the Polygons - Segregation dynamics
- Game Theory .net - Academic resources and lecture notes
- Game Theory Explorer - Build and analyze games online
- Auction Theory - Specialized in auction mechanisms
- Chris Said - Data science with game theory applications
- Nicky Case - Interactive explorable explanations
Math
- 3Blue1Brown - Beautiful math visualizations by Grant Sanderson
- Vedic Mathematics - Ancient Indian mental calculation techniques
- Vedic Maths - Main site
- Vedic Maths Forum India - Courses and resources
- Magical Methods - Techniques for competitive exams
- Mathsisfun Mental Math - Mental math tricks and techniques
- Cut The Knot - Interactive math puzzles and proofs by Alexander Bogomolny
- Mental Calculation World Cup - World records and competition info
- Soroban - Japanese abacus mental math
- Arthur Benjamin - Mathemagician, author of "Secrets of Mental Math"
- Project Euler - Mathematical programming challenges
- Art of Problem Solving - Competition math community and resources
- Brilliant - Interactive math and science courses
- Jane Street Puzzles - Monthly puzzles from the quant trading firm
- Desmos - Best online graphing calculator
- OEIS - Online Encyclopedia of Integer Sequences
- Wolfram MathWorld - Comprehensive math encyclopedia
- Numberphile - Math videos, surprisingly deep
- Mathologer - Visual math proofs
- Martin Gardner - Archive of the recreational math legend
- Setosa - Beautiful visual explanations
- Math ∩ Programming - Math for programmers by Jeremy Kun
- MacTutor - History of mathematics archive
- Terence Tao - Fields medalist's blog
- Red Blob Games - Interactive tutorials on game dev math
- Fractals
- Mandelbrot Set Explorer - Interactive fractal explorer
- Fractal Foundation - Education about fractals
- Fractal Forums - Community for fractal enthusiasts
Maker
- Hackaday - Hardware hacking and DIY electronics
- PCB Manufacturers
- Adafruit - Electronics kits, components, and tutorials
- SparkFun - Electronics components and learning resources
- Tindie - Marketplace for indie hardware makers
- Hackster.io - Hardware project community
- Make: Magazine - The OG maker publication
- Dangerous Prototypes - Open source hardware projects
- 3D Printing Models
- Thingiverse
- Printables - By Prusa
- Octopart - Electronic component search engine
- Ben Eater - Build a computer from scratch on breadboards
Useful
- iFixit - Repair guides and teardowns
- Consumer Rights Wiki - Wiki about consumer rights and protections
- eReplacementParts - Replacement parts for appliances and tools
- Atlas Obscura - Useful when travelling, interesting places to visit
- Internet Archive - Wayback Machine, books, media
- Have I Been Pwned - Check if your email was in data breaches
- AlternativeTo - Find alternatives to software
- Ear Training
- Tonedear - Free ear training exercises
- Teoria Exercises - Interval/chord recognition
- Free Books
- Standard Ebooks - Beautifully formatted public domain books
- Project Gutenberg - Free ebooks
- LibriVox - Free public domain audiobooks
- Omni Calculator - Calculators for everything
- Monkeytype - Minimalist typing test
- VirusTotal - Scan files/URLs for malware
- Primitive Ways - Traditional skills and no-tech navigation
- Wim Hof Method - Cold exposure and breathing techniques
- Linux Theming
- Pling - Themes, icons, wallpapers
- openDesktop.org - Desktop customization hub
- Fonts
- 1001 Fonts - Free fonts collection
- Fast Font - Quick font previewer
- Programming Fonts - Preview and compare coding fonts
- MonoLisa - Font designed for coding
- Fira Code - Monospace font with programming ligatures
- EasyReading - Dyslexia-friendly font
- Velvetyne - French libre font foundry, weird and wonderful
- Regex101 - Regex tester with explanations
Texts
- The Hacker's Diet - Engineer's approach to weight loss by John Walker
- Soldering is Easy - Comic by Mitch Altman
- 13 Sentences to Speak Any Language - Minimal phrases to get started
- The Jargon File - Hacker slang dictionary
- Beej's Guide to Network Programming - Classic networking tutorial
- Paul Graham's Essays - Startup/tech/life essays
- Politics and the English Language - George Orwell
- Mastering Emacs - Comprehensive Emacs guide by Mickey Petersen
- In the Beginning was the Command Line - Neal Stephenson essay
- Teach Yourself Programming in Ten Years - Peter Norvig's counterpoint to "Learn X in 24 Hours"
- The Twelve-Factor App - Methodology for building SaaS apps
- You and Your Research - Richard Hamming's famous talk
- Astral Codex Ten - Scott Alexander's rationalist blog
- The Architecture of Open Source Applications - How real software is built
- Things of Interest - Sam Hughes, fiction (Ra, Fine Structure) and programming
- Worse is Better - Richard Gabriel's famous essay on Unix philosophy
Online
- Alternative Search Engines - Independent, small web focused
- Wiby - Search engine for simple good sites
- Marginalia Search - Indexes small/old-school sites
- Mojeek - Independent with own index
- Stract - Open source, customizable domain boosting/blocking
- YaCy - Decentralized peer-to-peer search
- Grokipedia - AI alternative to Wikipedia (less political, thank god, at least in 2026)
- Unicode Search - Find special characters
- Amp What - Search by keyword
- Xah Lee Unicode Search - Comprehensive index
- Font Identification - Identify fonts from images
- Archive.today - Web archiving
- Lainchan - Cyberpunk-themed imageboard
- Merveilles - Solarpunk/minimal computing collective
- Gemini Protocol - Minimalist alternative to the web
Tech
- DigDeeper - Privacy and software freedom articles
- Richard Stallman's Personal Site - Stallman was always right
- Spyware Watchdog - Reviews software for privacy/spyware concerns
- cr.yp.to - Daniel J. Bernstein's cryptography site
- Suckless.org - Software that sucks less haha
- Mayfrost Alternatives Guide - Comprehensive list of freedom-respecting software
- Linux Distributions
- Artix Linux - Arch without Systemd (and XLibre)
- Parabola GNU/Linux-libre - Arch-based, 100% free software
- Devuan - Debian without Systemd
- OpenMandriva - Successor to Mandriva Linux
- Guix - GNU's functional package manager and distro
- Qubes OS - Security-focused OS
- NixOS - Declarative Linux distro
- Free Software Foundation - Defenders of software freedom
- GNU Project - The original free operating system
- Are We XLibre Yet? - GitHub site for the Xorg alternative XLibre
- Cornfield Electronics - Creators of the TV-B-Gone
- Install Gentoo Wiki - /g/ wiki with tech guides
- Xah Lee - Encyclopedic programming and keyboard guides
- /g/ - 4chan Tech Board
- Hacker News - Y Combinator's tech news aggregator
- Privacy Guides - Software recommendations for privacy
- PrivacyGuides
- PrivacyTools
- PRISM Break - Alternatives to common software
- EFF - Electronic Frontier Foundation
- Cat-v.org - Harmful stuff in CS, similar to suckless philosophy
- Lunduke - Based Tech Journal
- Hackernoon - Community-driven tech publication
- Dev.to - Developer community and blogging platform
- tldr pages - Simplified man pages
- Plan 9 - Bell Labs' successor to Unix
- 9front - Active Plan 9 fork, irreverent community
- Rob Pike's Papers - Co-creator of Plan 9 and Go
- Netlib - Repository of mathematical and numerical software
- Self-Hosting
- 100 Rabbits - Sailing couple making open source tools
- Permacomputing - Sustainable computing wiki
- Julia Evans - Zines and approachable tech explainers
- Dan Luu - Systems and performance deep dives
- Unixsheikh - Unix philosophy and minimalist computing
- Applied Divinity Studies - Tech criticism from rationalist angle
- Cold Takes - Holden Karnofsky on AI, philanthropy, future