This is a Tcl-based application, similar to Wikit, but offering more advanced features. From the web page:
"ProjectForum provides a powerful but easy-to-use solution for flexible workgroup collaboration and coordination of projects over the web."
"Use it for project planning, todo lists, design notes, task assignments, meeting notes, problem reports, team discussions, collecting feedback, research, brainstorming and more. "
ProjectForum is a commercial application. It uses the same underlying technology as CourseForum.
See http://www.courseforum.com/projectforum/ for all the details.