Emergence is a network only space combat arcade game. Emergence Software has games running a selection of maps all the time on the Internet. One of these maps is free to play on. To play on any of the other maps requires a key to have been purchased from http://emergence.uk.net/keys/. A key costs $14.50 (USD) and never expires. It is possible to run your own game servers, and create your own maps using the supplied map editor.

License: commercial ($14.50 (USD))

Additional System Requirements: Here are the Linux distros and minimum versions that are officially supported: Mandrake 9.2 Fedora Core 1 Knoppix 3.3 Debian Testing Gentoo 1.4 SuSE 8.2 Slackware 9.1 MEPIS 2003.08 Xandros Desktop 2.0 Linspire 4.5 Red Hat 9 / RHEL 3