Trac（下架中）

Trac is a web-based software project management and bug/issue tracking system emphasizing ease of use and low ceremony. It provides an integrated Wiki, an interface to version control systems, and a number of convenient ways to stay on top of events and changes within a project.

Trac is distributed under the modified BSD License.
The complete text of the license can be found online as well as in the COPYING file included in the distribution.