Event Hunt - Startups and Tech Events Curated By Locals
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Konflist - Curated list of tech conferences all around the world!
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
TechEvents.co - Tech and startup events aggregator
pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features