WiFi Map - A crowdsourced list of routers and passwords
Foundler - Online hackathon weekends. Attend every other week.
Get Free Fucking WiFi - Find the best fucking WiFi just around the corner.
HackHub - Host tech events and hackathons with ease 👨💻🛠
Instabridge - Crowdsourced free wifi (now on Android)
Confs.tech - Open source list of tech conferences: JS / Ruby / Data etc.