sys-apps/apt
Advanced front-end for dpkg
USE Flags
doc
Global: Adds extra documentation (API, Javadoc, etc)
nls
Global: Adds Native Language Support (using gettext - GNU locale utilities)
test
Global: Workaround to pull in packages needed to run with FEATURES=test. Portage-2.1.2 handles this internally, so don't set it in make.conf/package.use anymore