GPF posted here about hes latest release, OpenJazzDC.

This is a port of OpenJazz for the Sega Dreamcast.

OpenJazz is a free, open-source version of the classic Jazz Jackrabbit™ games. OpenJazz can be compiled on a wide range of operating systems, including Windows 98/Me/XP and Linux. To play, you will need the files from one of the original games.

Download it from GPF's Site