Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Text A Coder - Send a text, get a developer and project manager instantly
Facebook Local - Discover places to go and events happening near you
CodersClan for Trello - Outsource your code tasks directly from Trello
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
rysolv - Fix open source issues, get paid