nvidia-texture-tools : a set of cuda-enabled texture tools and compressors ( http://developer.nvidia.com/object/texture_tools.html )
radeondb : a Radeon debugging tool for replaying GPU command stream ( http://jglisse.livejournal.com/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a nikai
For Paludis use this rsync : rsync://gentoo.zugaina.org/nikai-portage
If you have a problem : ycarus(-at-)zugaina.org