Trac is a minimalistic web-based software project management and bug/issue tracking system. It provides an interface to revision control systems (Subversion), an integrated Wiki and convenient report facilities.
It also has a dependancy on clearsilver: http://clearsilver.net
a "language-neutral HTML template system" which is also not yet in portage.
clearsilver-0.9.7 appears to be the current release.
Steps to Reproduce:
I'm sorry, but we currently don't have enough volunteers to write ebuilds on request. Why not have a go at writing your own ebuild? There's plenty of documentation on http://www.gentoo.org/, and we'll happily look at any ebuild that you wish to submit.