app-admin
app-office
app-vim
dev-cpp
dev-lang
dev-libs
dev-python
eclass
licenses
media-libs
net-ftp
net-misc
profiles
sci-astronomy
sci-biology
sci-chemistry
sci-electronics
sci-geosciences
sci-libs
sci-mathematics
sci-misc
sci-physics
sci-visualization
sys-cluster
sys-infiniband