Chromium B.S.U.

Chromium B.S.U. is a fast paced arcade space shooter. It is written using the SDL and OpenAL libraries. According to the license file in the Debian package, the game is published under the "Clarified Artistic License".

The official homepage contains a license which is somewhere between the too-unclear-to-consider-free-for-FSF Artistic License 1.0 and the Clarified Artistic License.