TechCo App is a directory of tech events and conferences happening around the world: Online and Offline.
Features: Google Account Sing Up A way to add/suggest conferences
TechEvents.co - Tech and startup events aggregator
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
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.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Flare - Anonymously share & discover real-time events in your city
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.