Browse overlay stuff
acct-group
dev-tex
sci-mathematics
acct-user
dev-texlive
sci-misc
app-accessibility
dev-util
sci-ml
app-admin
dev-vcs
sci-physics
app-editors
games-misc
sci-visualization
app-misc
games-roguelike
sys-apps
app-office
llvm-core
sys-cluster
app-portage
mail-client
sys-fs
app-text
media-gfx
sys-kernel
dev-build
media-libs
sys-libs
dev-cpp
media-plugins
virtual
dev-debug
media-sound
www-apps
dev-lang
media-video
www-misc
dev-libs
net-im
x11-apps
dev-ml
net-libs
x11-libs
dev-perl
net-misc
x11-plugins
dev-python
sci-libs
x11-terms
dev-qt