Portage tree

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The Portage tree is a large hierarchy containing ebuilds for all of the officially sanctioned software packages that can be compiled and installed by the Portage package management system (via the emerge command).

The thousands of available packages are arranged in over a hundred categories, such as dev-lang (for developers, related to programming languages) or net-mail (networking, related to e-mail).

A list of all categories, suitable for browsing the entire tree, may be found at:

http://packages.gentoo.org/categories/ — at the official website for package information
http://gentoo-portage.com/Browse — unofficial, differently formatted version of the same information

[edit] Overview of top-level categories

The main top-level categories in the Portage tree are:

app: Applications of all sorts, from system utilities to full-blown office suites (word processing, etc.).
dev: Software mainly of interest to software developers, including many programming languages.
games: Games, of course.
mail: E-mail clients and mail transport applications.
media: Fonts, graphics, and other multimedia-related software.
net: Networking software.
sci: Packages related to science and mathematics.
sys: Mostly low-level system software, including kernels, filesystem software, power management, etc.
virtual: Not packages per se, these exist only to pull in other packages as dependencies, thereby serving as "collections" of interrelated packages (e.g., Emacs, JDK, or OpenGL)
www: Web-related software, such as web servers and web browsers.

The remaining top-level categories are mostly related to different desktop environments and software development environments.

gnome: GNOME desktop environment.
gnustep: GNUstep widget toolkit and application development environment.
java: Java programming language.
kde: KDE desktop environment.
perl: Perl programming language.
rox: ROX desktop environment.
sec: SELinux security policies.
x11: X11 graphics subsystem.
xfce: Xfce desktop environment.

[edit] Full list of categories

The complete list of categories (as of July 2008) is shown below, along with brief descriptions and links to package lists at both packages.gentoo.org ("PGO") and gentoo-portage.com ("GPC").

Category	Description	List of packages
app-accessibility	accessibility — keyboard/mouse aids for users with impaired mobility, speech synthesis, etc.	PGO, GPC
app-admin	system administration utilities — system log analyzers, eselect packages, various system monitors, user account/password utilities, system configuration tools, etc.	PGO, GPC
app-antivirus	antivirus software	PGO, GPC
app-arch	compression and archiving utiities (zip, tar, rar, par, bzip2, etc.)	PGO, GPC
app-backup	system backup software	PGO, GPC
app-benchmarks	benchmarking software	PGO, GPC
app-cdr	CD/DVD burning (nero, k3b, etc.) and related software	PGO, GPC
app-crypt	file/filesystem/stream encryption, hash/checksum utilities	PGO, GPC
app-dicts	dictionary files for StarDict, FreeDict, OpenDict, MySpell, Aspell, Ispell, and other dictionary and spell-checking applications (and Sword)	PGO, GPC
app-doc		PGO, GPC
app-editors		PGO, GPC
app-emacs		PGO, GPC
app-emulation		PGO, GPC
app-forensics		PGO, GPC
app-i18n		PGO, GPC
app-laptop		PGO, GPC
app-misc		PGO, GPC
app-mobilephone		PGO, GPC
app-office		PGO, GPC
app-pda		PGO, GPC
app-portage		PGO, GPC
app-shells		PGO, GPC
app-text		PGO, GPC
app-vim		PGO, GPC
app-xemacs		PGO, GPC
dev-ada		PGO, GPC
dev-cpp		PGO, GPC
dev-db		PGO, GPC
dev-dotnet		PGO, GPC
dev-embedded		PGO, GPC
dev-games		PGO, GPC
dev-haskell		PGO, GPC
dev-java		PGO, GPC
dev-lang		PGO, GPC
dev-libs		PGO, GPC
dev-lisp		PGO, GPC
dev-ml		PGO, GPC
dev-perl		PGO, GPC
dev-php		PGO, GPC
dev-php4		PGO, GPC
dev-php5		PGO, GPC
dev-python		PGO, GPC
dev-ruby		PGO, GPC
dev-scheme		PGO, GPC
dev-tcltk		PGO, GPC
dev-tex		PGO, GPC
dev-texlive		PGO, GPC
dev-tinyos		PGO, GPC
dev-util		PGO, GPC
games-action		PGO, GPC
games-arcade		PGO, GPC
games-board		PGO, GPC
games-emulation		PGO, GPC
games-engines		PGO, GPC
games-fps		PGO, GPC
games-kids		PGO, GPC
games-misc		PGO, GPC
games-mud		PGO, GPC
games-puzzle		PGO, GPC
games-roguelike		PGO, GPC
games-rpg		PGO, GPC
games-server		PGO, GPC
games-simulation		PGO, GPC
games-sports		PGO, GPC
games-strategy		PGO, GPC
games-util		PGO, GPC
gnome-base		PGO, GPC
gnome-extra		PGO, GPC
gnustep-apps		PGO, GPC
gnustep-base		PGO, GPC
gnustep-libs		PGO, GPC
java-virtuals		PGO, GPC
kde-base		PGO, GPC
kde-misc		PGO, GPC
mail-client		PGO, GPC
mail-filter		PGO, GPC
mail-mta		PGO, GPC
media-fonts		PGO, GPC
media-gfx		PGO, GPC
media-libs		PGO, GPC
media-plugins		PGO, GPC
media-radio		PGO, GPC
media-sound		PGO, GPC
media-tv		PGO, GPC
media-video		PGO, GPC
net-analyzer		PGO, GPC
net-dialup		PGO, GPC
net-dns		PGO, GPC
net-firewall		PGO, GPC
net-fs		PGO, GPC
net-ftp		PGO, GPC
net-im		PGO, GPC
net-irc		PGO, GPC
net-libs		PGO, GPC
net-mail		PGO, GPC
net-misc		PGO, GPC
net-nds		PGO, GPC
net-news		PGO, GPC
net-nntp		PGO, GPC
net-p2p		PGO, GPC
net-print		PGO, GPC
net-proxy		PGO, GPC
net-voip		PGO, GPC
net-wireless		PGO, GPC
net-www		PGO, GPC
net-zope		PGO, GPC
perl-core		PGO, GPC
rox-base		PGO, GPC
rox-extra		PGO, GPC
sci-astronomy		PGO, GPC
sci-biology		PGO, GPC
sci-calculators		PGO, GPC
sci-chemistry		PGO, GPC
sci-electronics		PGO, GPC
sci-geosciences		PGO, GPC
sci-libs		PGO, GPC
sci-mathematics		PGO, GPC
sci-misc		PGO, GPC
sci-physics		PGO, GPC
sci-visualization		PGO, GPC
sec-policy		PGO, GPC
sys-apps		PGO, GPC
sys-auth		PGO, GPC
sys-block		PGO, GPC
sys-boot		PGO, GPC
sys-cluster		PGO, GPC
sys-devel		PGO, GPC
sys-freebsd		PGO, GPC
sys-fs		PGO, GPC
sys-kernel		PGO, GPC
sys-libs		PGO, GPC
sys-power		PGO, GPC
sys-process		PGO, GPC
virtual		PGO, GPC
www-apache		PGO, GPC
www-apps		PGO, GPC
www-client		PGO, GPC
www-misc		PGO, GPC
www-servers		PGO, GPC
x11-apps		PGO, GPC
x11-base		PGO, GPC
x11-drivers		PGO, GPC
x11-libs		PGO, GPC
x11-misc		PGO, GPC
x11-plugins		PGO, GPC
x11-proto		PGO, GPC
x11-terms		PGO, GPC
x11-themes		PGO, GPC
x11-wm		PGO, GPC
xfce-base		PGO, GPC
xfce-extra		PGO, GPC