entoo is a config file editing tool.
It parses config files into abstrct syntax trees for automated and visual editing. Ventoo is still under heavy development, but there are a few releases for download, as well as a git repository to pull from.

Releases
You can see ebuilds and related files here.
There are no releases right now, but there are public repositories.
Generally the master branch is kept fairly stable since I code in local branches then merge them only when each local branch is stable.

To clone the repo:
# git clone git://git.overlays.gentoo.org/proj/ventoo

Manual
Code Documentation