WiFi Map - A crowdsourced list of routers and passwords
Foundler - Online hackathon weekends. Attend every other week.
Café Wifi Search 🔍 - Find great cafés to work from, worldwide.
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.