I have a collection of community repositories for amd64 architecture machines. These packages are built from my portage overlay. Feel free to add these if any of the packages inside might be of use, but please be aware they are provided as-is with no guarantees.
packages.sihnon.net
Packages suitable for machines of any designation.
[packages.sihnon.net] desc = Sihnon Entropy Repository repo = http://pkg.sihnon.net/entropy enabled = true
server.packages.sihnon.net
Packages suitable for server machines (without X).
[packages.sihnon.net] desc = Sihnon Server Entropy Repository repo = http://pkg.sihnon.net/entropy enabled = true
desktop.packages.sihnon.net
Packages suitable for desktop machines (with X).
[packages.sihnon.net] desc = Sihnon Server Entropy Repository repo = http://pkg.sihnon.net/entropy enabled = true