Scrum for Trello - Adds functionality to Trello boards for your Scrum projects.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Ora - Welcome to your team’s command center. A place to track projects. Tasks. Time. Commits. Status Reports. Your entire product or business! It's the fastest-growing productivity suite your team needs right now!
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
UpDiagram - Free agile project management tool for scrum team
Bigtent - BigTent is a web-based organization and communication portal for groups.