OpenJazz
About
OJ
About OpenJazz
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.

With the demise of DOS-based operating systems, it became necessary to use emulators to play old DOS games. Jazz Jackrabbit™ deserves more - and would benefit greatly from new features.

OpenJazz was started on the 23rd of August, 2005, by AJ Thomson. Academic pressures put the project on hold until late December 2005. The source code was released on the 25th, and the first version with a degree of playability was released on the 15th of January. Since then, a variety of ports have been released by other people.

In 2009, a multiplayer version was released.
About Jazz Jackrabbit™
Jazz Jackrabbit™ is a PC platform game. Produced by Epic Games (then Epic MegaGames), it was first released in 1994. The fast-paced, colourful gameplay proved popular, and the game won PC Format's Arcade Game of the Year award. Many people still fondly recall the shareware versions.

The full game is available from GOG.