Kalam Labs - Twitch for Science
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
MathCrunch - Learn math stress free
Event Hunt - Startups and Tech Events Curated By Locals
SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets