Gentoo
Currently, I am a Gentoo Linux developer, and you can find my personal overlay at git.overlays.gentoo.org. Or you can view the GitWeb.
You can also check it out by doing the following (requires having dev-util/git installed!):
git clone git://git.overlays.gentoo.org/dev/steev
I am also a member of the Mobile, GNOME, and Gentopia herds.
The mobile herd does not have an overlay, however GNOME and Gentopia both do, they are also listed at the above address.
Or you can check out the overlays via:
git clone git://git.overlays.gentoo.org/proj/gnome
git clone git://git.overlays.gentoo.org/proj/gentopia