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

Collaboration

• Ben Balter - 15 rules for communicating at GitHub
• Dale Emery - model of motivation : Motivation = Ability × Results × Preferences
• Jbrains.ca - What If We Forget To Write the Tests?

Free Online tools

• BuiltWith - Find out what technology a website is built with
• 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

Health and Work-Life Balance

• Matt Might - Tips for work-life balance

Productivity

• Medium - The 30 second habit with a lifelong impact
• Jbrains.ca - The Two-Minute Rule / When You’re Buried in Email
• Jbrains.ca - Avoiding Distractions While Programming
• Jbrains.ca - Flow Requires Focus, Not Time
• BugMeNot - enter a domain or url and find shared logins

Troubleshooting

• pluralsight - 3 troubleshooting tips that can save you a world of time

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
• javarevisited - 11 Tips to become a better Interviewer?
• 10 C99 tricks
• Java Performance Tuning - regular tips and news about java performance tuning

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
• Sonatype - KISSSSS : good approach to ensure you're successful with containers
• SlideShare - Optimizing Docker Images

Git

• Dissecting Git's Guts - Git Merge 2016 + Cheat Sheet of git commands
• 20 Tricks with Git and Shell - Git Merge 2016
• 25 Tips for Intermediate Git Users

Productivity

• Java Code Geeks - 10 Productivity tips for software developers

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
• blockloop.io - Mastering Bash and Terminal
• kvz.io - Best Practices for Writing Bash Scripts
• Matt Might - 3 shell scripts to improve your writing