I'm currently looking at the following stack:
- Apache Tomcat and Apache HTTP Server for web interfaces
- Chandler for time tracking and coordination and Chandler Server for bringing everything together.
- Trac for bug tracking and user feedback management (eg - dumping user feedback into the wiki, adding bugs, SVN tie ins)
- Subversion for version control
- TortoiseSVN for access to subversion repositories
- Documentation on proper use of all of these tools (what gets checked in where, etc)