Drupal based open source project management.

Codebase is a git repository hosting service with a complete, full featured web-interface to provide you with complete access to your repositories and projects.

Orchestrate is a powerful web based scheduling application. Accessible from any Internet connected computer, Orchestrate helps you manage all aspects of your client contracts including tasks, locations and people. It is easy to use, and particularly suitable for Service and Maintenance professionals.

Goplan is an online project management solution. It allows teams and individuals to collaborate through tasks, file management, real-time chat, online calendaring, and many other features. Someone finally came out with a competitor to Basecamp.