OpenTyrian is a port of the DOS shoot-em-up Tyrian.
Tyrian is an arcade-style vertical scrolling shooter. The story is set in 20,031 where you play as Trent Hawkins, a skilled fighter-pilot employed to fight Microsol and save the galaxy.
Jason Emery generously gave the OpenTyrian developers a copy of the Tyrian 2.1 source code, which has since been ported from Turbo Pascal to C. The port uses SDL, making it easily cross-platform.
Development is ongoing at OpenTyrian Website
AROS port was done by Yannick Erb, and takes advantage of some AROS SDL features such as Joypad support.
Download at: Yannick's Site
There are some resources spread around the net.
For example here is the Tyrian Fansite
And multiple gfx resources and art for the game as well dedicated handheld ports.