Huntathon - Browse and submit Product Hunt Global Hackathon projects
hackattic - No nonsense, real world programming challenges
CoFoundersLab - Meet 250,000+ entrepreneurs online
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
FounderWheel - Meet potential co-founders everyday
Takehome - Effective and humane coding challenges for candidates