Computação, ciência e matemática (computing, science and math)

• Why numbering should start at zero, by E. W. Dijkstra
• How to read a paper, by S. Keshav
• Theoretical computer science cheat sheet
• RANDOM.ORG analysis and explanation on randomness
• How to write a git commit message
• How to write a git commit message, part 2
• The missing semester of your CS education
• The art of HPC
• Build your own X
• Sad Servers: troubleshoot and fix servers
• SSH tunnelling
• Hack the box: hacking labs
• Open source licenses
• Hacksplaining lessons, explanation on many major vulnerabilities
• Systems Approach, a collection of open books on many network topics
• Green Tea Press, a collection of open books on many Computer Science topics

Novos idiomas (language learning)

• Lingolia
• The German Project
• dict.cc German dictionary
• DWDS German dictionary
• Duden German dictionary
• German exercises, tests and grammar

A vida, o universo e tudo o mais (the life, the universe and everything else)

• Eletricity map of the world
• Map of submarine Network Cables
• Map with base transceiver stations in Brazil
• Another map with base transceiver stations in Brazil
• Mobile coverage in Brazil
• Battery University
• Internet Artifacts

Cheat sheets

• Mutt
• Vim
• Vim indentation, an answer from StackOverflow
• Makefile
• Tmux
• Binary fundamentals
• Low level bit hacks
• Beamer appearance cheat sheet

Para se divertir (for fun)

• Abbott and Costello performing "Who's on first?". A great take on how important it is to name things a good way
• Hacker titles for business cards
• A take on non-sense things on programming languages
• Explanation on the 'Twelve men and a seesaw' problem, that was posed in Brooklyn 99's episode 'Captain Peralta'
• Playing videos on the Factorio game

Viagens (travelling)

• Wikivoyage
• Wikitravel