Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

WiFi Map - A crowdsourced list of routers and passwords

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Café Wifi Search 🔍 - Find great cafés to work from, worldwide.

Bigtent - BigTent is a web-based organization and communication portal for groups.

Instabridge - Crowdsourced free wifi (now on Android)