Looking at forum of Arch Linux I found this topic, already has more than a year, but... who cares? :)

What these guys did was basically get all the games that are in AUR and are not in the repository community, compile them and make available in a repository, saving us from having to compile and keep looking for updates on AUR.

To add the repository + mirrors put this on /etc/pacman.conf:

[arch-games]
Include = /etc/pacman.d/archgames_mirrorlist

Create /etc/pacman.d/archgames_mirrorlist and put this:

Server = http://arch.twilightlair.net/games/$ARCH
Server = http://pseudoform.org/arch-games/games/$ARCH
Server = http://repo.exigen.org/arch/games/$ARCH

Where $ARCH is i686 or x86_64(run arch)

The first is the main repository, the other 2 are the active mirrors until today's date.

See the site ;)

If you search for games to Ubuntu/Kubuntu see in UbuntuGames.org.

If you are a lover of ROMs and emulators, you'll love the Gelide. He is a file cataloger that organizes the ROMs on your computer in a list organized by platform, which facilitates access to them.

It has a complete list of many of the most popular emulators platforms, such Atari, Amstrad, Game Boy, Mame, Mega Drive, Nes and Nintendo 64. As for ROMs, you can sort them by year of release, name, note by the User, among others.

Gelide also allows you to configure emulators that accept configuration command. He saves these settings so you do not have to keep typing them each time you open the emulator.

Source: Baixaki(Portuguese of Brazil)

Remember, the Gelide is NOT an emulator, just a front-end (GUI) to organize your ROMs, when open a ROM it simply calls the selected emulator with some options to run :)

Here some screens:

Window 'About'

Windows 'About' from emulator Mupen64Plus

For more  Screens see here

There are packages of it in the AUR (For users of ArchLinux, DEB version (For users of Debian based Distros like Ubuntu. Please note that the version of that. Deb is 0.1.1) and source code (requires gtkmm, gconfmm and libxml2 to compile)