TechEvents.co - Tech and startup events aggregator
Exist - Track everything in one place, understand your life.
Facebook Local - Discover places to go and events happening near you
Zenobase - Zenobase helps store and visualize data.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Swarm - Swarm lets you earn prizes and compete with friends based on the places you go.