Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.
Event Hunt - Startups and Tech Events Curated By Locals
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Leade.rs - Leaders matches event organizers with speakers in tech.
Meetup for iOS and Android - Discover groups that are all about the things you love
TechEvents.co - Tech and startup events aggregator