2016 Photo Challenge - Take a photo every day for 366 days
Huntathon - Browse and submit Product Hunt Global Hackathon projects
SPAR! - Challenge your friends. Put money on the line. Get better.
Foundler - Online hackathon weekends. Attend every other week.
ShutterSpots - Find & share photo locations nearby & all over the world!
Confs.tech - Open source list of tech conferences: JS / Ruby / Data etc.