WiFi Map - A crowdsourced list of routers and passwords
Huntathon - Browse and submit Product Hunt Global Hackathon projects
Get Free Fucking WiFi - Find the best fucking WiFi just around the corner.
Foundler - Online hackathon weekends. Attend every other week.
Instabridge - Crowdsourced free wifi (now on Android)
Confs.tech - Open source list of tech conferences: JS / Ruby / Data etc.