GoLocalBot. The project is closed - Platform for volunteers, NGOs, activists and crowdmapping.

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

Golden Volunteer Organizer - Automated volunteer recruitment, management, and tracking

TechEvents.co - Tech and startup events aggregator

DEED - On-demand app that makes volunteering easy, social and fun!

Facebook Local - Discover places to go and events happening near you