I just want to centralize my findings and bookmarks in a central location, and share them.

Free Online tools

• Dillinger - Online Markdown Editor
• Air Mail - temporary email service
• StackEdit - in-browser markdown editor
• XKPasswd - secure memorable password generator inspired by XKCD

Games

• BoardGameGeek - most complete board game database that holds tons of reviews, images and videos

Linux

• OSTechNix - How To Securely And Permanently Delete Your Data In Linux
• kahun/awesome-sysadmin - A curated list of amazingly awesome open source sysadmin resources

Music

• Rate Your Music - one of the most complete music database for cataloging, tagging and reviewing your music collection
• TasteKid - get recommendations for music but also tv shows, films, games, books...

Programming

• Mastodon - take a break from twitter and switch to one of mastodon instances.
• InfoQ - news, videos, books for software developers
• /r/programming - reddit about programming
• Hack Reactor - Infographic of productivity tips for developers, to share with your teammates

Clean Code

• Clean Code Cheat Sheet v2.4 - cheat sheet for clean code

Containers

• Docker tips - Mikes monster list of docker tips
• Docker Documentation - Best practices for writing Dockerfiles
• KISSSSS - good approach to ensure you're successful with containers

Git

• https://www.youtube.com/watch?v=Y2Msq90ZknI - Dissecting Git's Guts - Git Merge 2016 + Cheat Sheet of git commands
• https://www.youtube.com/watch?v=d-T51nhmFhQ - 20 Tricks with Git and Shell - Git Merge 2016

Programmer humor

• CommitStrip - daily life of developers
• Geek&Poke - cartoons
• The Profound Programmer - Programming frustrations expressed through profane, beautiful photographs

Scripting

• Bash Hackers Wiki - obsolete and deprecated syntax
• Bash Pitfalls - common errors that Bash programmers make
• ShellCheck - finds bugs in your shell scripts.
• Atlassian - Ten tips for wonderful bash productivity