Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
WordUp App - Discover the smartest app for learning English vocabulary, improving pronunciation, and excelling in exams like IELTS and TOEFL. Start exploring WordUp today.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
1up Events - Corporate events as a service