Horizon - Horizon is a realtime, open-source backend for JavaScript apps.
TechEvents.co - Tech and startup events aggregator
Nomad House - Houses around the world for nomads to live and work together
Facebook Local - Discover places to go and events happening near you
ViaHero - Don't plan your trip yourself, let a Hero come to the rescue
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets