Event Hunt - Startups and Tech Events Curated By Locals
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
TechEvents.co - Tech and startup events aggregator
Konflist - Curated list of tech conferences all around the world!
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Hero35 - The best place to watch curated dev conference talks