Guestboard - Lead powerfully-organized group events with Guestboard – a modular event platform that gives groups of 10-1000+ people a central space to coordinate, build excitement, and save money. No more crazy email threads. No more massive group texts.

Guides by Lonely Planet - Explore city guides curated by experts.

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Go Button - Go Button is a mobile audio app designed to provide professional playback of music and sound effects for live shows. It provides a creative, self-contained show control system that runs on your iPad, iPhone, or iPod touch.

Mobilizon - A free and federated tool to get our events off Facebook

AudioBus - With Audiobus, the revolutionary new inter-app audio routing system, you can connect your...