I like its simplicity to set up on a Debian system, it's maintained by the community; all you need is to use apt-get install trac and upgrade from time to time. The bug tracker is simple, fast, but sufficient in most cases. Review collected by and hosted on G2.com.
The wiki markup is not standard and can't be easily exported, it would make sense to support markdown and make it optionally editable using an SCM. Review collected by and hosted on G2.com.



