What are some alternatives?
GroupSpaces - Free Group Website, Membership Database, Listserv Mailing List, Online Group Management Software : GroupSpaces
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
TeamClerk - Team Clerk is project and task management software that automatically keeps your team organized and monitors progress of all of your projects and tasks. Let us organize what you do,so you can focus on why you do it.
Basecamp - A simple and elegant project management system.
Redmine - Flexible project management web application