The app-accessibility category contains packages which help with accessibility (for example, screen readers).

The app-admin category contains non-core applications which relate to system administration.

The app-antivirus category contains antivirus software.

The app-arch category contains tools for archiving, compressing and uncompressing files or groups of files.

The app-backup category contains tools for performing backups of data, including both full and incremental backups, as well as backups to other media (CD-R, Tape, etc.).

The app-benchmarks category contains benchmarking software.

The app-cdr category contains software for writing CDs and DVDs, and for working with .iso files.

The app-crypt category contains cryptographic (encryption, decryption, steganography and signing) software.

The app-dicts category contains dictionary and word-list packages.

The app-doc category contains various miscellaneous documentation collections.

The app-editors category contains text editors.

The app-emacs category contains extension packages for the Emacs text editor.

The app-emulation category contains emulation software.

The app-forensics category contains software which helps detect and analyse security breaches.

The app-i18n category contains internationalisation-related packages.

The app-laptop category contains packages which are designed to work with certain kinds of laptop or notebook computer.

The app-misc category contains various miscellaneous application packages which don't belong anywhere else.

The app-mobilephone category contains software for working with mobile phones.

The app-office category contains 'office' (word processing, spreadsheets, presentation) software packages.

The app-officeext category contains extension packages for LibreOffice and OpenOffice.

The app-pda category contains software for working with personal digital assistants or hand-held computers.

The app-portage category contains software which works with portage or ebuilds.

The app-shells category contains shells and their extensions.

The app-text category contains tools for working with human-language text files.

The app-vim category contains plugins, syntax file and spelling packages for the Vim text editor.

The app-xemacs category contains extensions for the XEmacs text editor.

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The dev-ada category contains libraries and utilities relevant to the Ada programming language.

The dev-cpp category contains libraries and utilities relevant to the c++ programming language.

The dev-db category contains libraries and utilities for database related programming.

The dev-dotnet category contains libraries and utilities relevant to the .NET programming environment.

The dev-embedded category contains libraries and utilities relevant to embedded programming.

The dev-games category contains libraries and utilities relevant to games programming.

The dev-haskell category contains libraries and utilities relevant to the Haskell programming language.

The dev-java category contains libraries and utilities relevant to the Java programming language.

The dev-lang category contains various programming language implementations and related tools.

The dev-libs category contains various miscellaneous programming libraries.

The dev-lisp category contains libraries and utilities relevant to the Lisp programming language.

The dev-lua category contains libraries, utilities or bindings written in or for the Lua programming language.

The dev-ml category contains libraries and utilities relevant to the ML programming language.

The dev-perl category contains libraries and utilities relevant to the Perl programming language.

The dev-php category contains libraries and utilities relevant to the PHP programming language.

The dev-php5 category contains libraries, utilities and PECL packages only for version 5 of the PHP programming language.

The dev-python category contains libraries, utilities or bindings written in or for the Python programming language.

The dev-ruby category contains libraries and utilities relevant to the Ruby programming language.

The dev-scheme category contains libraries and utilities relevant to the Scheme programming language.

The dev-tcltk category contains Tcl- and Tk-related libraries and tools.

The dev-tex category contains libraries and tools useful when working with TeX and TeX-based environments such as LaTeX.

The dev-texlive category contains various TeXLive's packages.

The dev-tinyos category contains libraries and utilities of the TinyOS operating system for embedded wireless sensor networks.

The dev-util category contains various miscellaneous development utilities.

The dev-vcs category contains utilities focused on version control.

The games-action category contains action games.

The games-arcade category contains arcade games.

The games-board category contains board games.

The games-emulation category contains game platform emulators.

The games-engines category contains game engines.

The games-fps category contains first person shooter games.

The games-kids category contains games designed for children.

The games-misc category contains miscellaneous games which do not fit into other games- categories.

The games-mud category contains multi-user dungeon games.

The games-puzzle category contains puzzle games.

The games-roguelike category contains games which resemble Rogue's style.

The games-rpg category contains role-playing games.

The games-server category contains game servers.

The games-simulation category contains simulation games.

The games-sports category contains sports games.

The games-strategy category contains strategy games.

The games-util category contains various game-related utilities.

The gnome-base category contains core GNOME packages.

The gnome-extra category contains additional non-core GNOME packages.

The gnustep-apps category contains GNUstep applications.

The gnustep-base category contains GNUstep base packages.

The gnustep-libs category contains GNUstep libraries.

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The java-virtuals category contains packages which satisfy virtual dependencies. These virtuals install a file which is used by the java-config system to provide information like classpath and minimum required vm values.

The kde-base category contains core KDE packages.

The kde-misc category contains various miscellaneous KDE packages.

The lxde-base category contains core packages for LXDE, the Lightweight X11 Desktop Environment.

The mail-client category contains email clients.

The mail-filter category contains email filtering software.

The mail-mta category contains mail transport agent packages.

The media-fonts category contains fonts.

The media-gfx category contains graphics-related packages.

The media-libs category contains media-related libraries.

The media-plugins category contains plugin packages for various media applications.

The media-radio category contains radio-related media applications.

The media-sound category contains sound, music and audio applications.

The media-tv category contains television-related applications.

The media-video category contains video-related applications.

The net-analyzer category contains network analysis software.

The net-dialup category contains dialup-related networking software.

The net-dns category contains DNS (Domain Name Service) related software.

The net-firewall category contains network firewall software.

The net-fs category contains network filesystem packages.

The net-ftp contains FTP (File Transfer Protocol) software.

The net-im category contains instant messaging software.

The net-irc category contains IRC (Internet Relay Chat) clients and servers.

The net-libs category contains libraries that are network-related.

The net-mail category contains various email-related utilities.

The net-misc category contains various miscellaneous networking tools and utilities.

The net-nds category contains NDS (NetWare Directory Services) software.

The net-news category contains news-related network software.

The net-nntp category contains NNTP (Network News Transfer Protocol) software.

The net-p2p category contains peer-to-peer networking applications.

The net-print category contains network printing packages.

The net-proxy category contains network proxy software.

The net-voip category contains packages related to Voice-over-IP

The net-wireless category contains wireless networking software and utilities.

The net-www category contains various WWW clients that have not yet moved into www- categories.

The net-zope category contains all Zope (zope.org) related software including third party products and tools.

The perl-core category contains libraries and utilities relevant to the Perl programming language.

The rox-base category contains core Rox packages.

The rox-extra category contains extra non-core Rox packages.

The sci-astronomy category contains software that can be used in astronomical and related scientific environments.

The sci-biology category contains software that can be used in biological and related scientific environments.

The sci-calculators category contains scientific calculator packages.

The sci-chemistry category contains software that can be used in chemistral scientific environments.

The sci-electronics category contains electronics packages.

The sci-geosciences category contains geosciences-related software.

The sci-libs category contains various science-related libraries.

The sci-mathematics category contains mathematical software.

The sci-misc category contains various miscellaneous science applications which do not fit any other sci-* category.

The sci-physics category contains physics related software.

The sci-visualization category contains scientific visualization applications.

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The sys-apps category contains various core system applications, and some non-core system applications which have not yet been moved out into other sys- categories.

The sys-auth category contains applications and libraries to support authentication and authorization facilities. Here belongs PAM modules, NSS modules and login apps.

The sys-block category contains packages which work with block devices.

The sys-boot category contains bootloaders and related tools.

The sys-cluster category contains cluster-related software.

The sys-devel category contains various core system development tools and libraries.

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The sys-fs category contains filesystem tools and utilities.

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The sys-kernel category contains kernel source ebuilds and kernel-related tools.

The sys-libs category contains various system-level libraries.

The sys-power category contains software which handles power management, including CPU frequency scaling tools.

The sys-process category contains packages which query or manipulate processes. The 'cron' daemons are included in this.

The virtual category contains packages which satisfy virtual dependencies.

The www-apache category contains modules for the Apache webserver.

The www-apps category contains various world wide web applications.

The www-client category contains world wide web clients.

The www-misc category contains various miscellaneous world wide web software.

The www-plugins category contains plug-ins for Web browsers.

The www-servers category contains web server packages.

x11-apps contains applications distributed as part of X.Org X11.

The x11-base category contains various X11 base implementations.

x11-drivers contain drivers that interface with the core X11 server.

The x11-libs category contains various X11-related libraries.

The x11-misc category contains miscellaneous X11 applications which do not belong elsewhere.

The x11-plugins category contains plugin packages for various X11 applications.

x11-proto contains the X11 protocol headers.

The x11-terms category contains terminal emulators for X11 environments.

The x11-themes category contains various theme and style packages for X11 applications.

The x11-wm category contains X11 window managers.

The xfce-base category contains base XFCE packages.

The xfce-extra category contains non-core XFCE applications.