"Linux is only free if your time is worthless."
I never met an open source project that compiled on the first try.
Websites that I actively develop:
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Stack Overflow
Q&A for professional and enthusiast programmers
Server Fault
Q&A for professional system and network administrators
Martial Arts
Q&A for students and teachers of all martial arts
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Japanese Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Japanese language
Physics
Q&A for active researchers, academics and students of physics
Photography
Q&A for professional, enthusiast and amateur photographers
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Game Development
Q&A for professional and independent game developers
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
French Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
Sports
Q&A for participants in team and individual sport activities
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles