OpenJazz
About
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, macOS, GNU/Linux and BSD flavors. Also ports are available for some homebrew platforms, consoles and handhelds. See Platforms for details. You can even play it inside your web browser.
To play, you will need the files from one of the original games.
With the demise of DOS-based operating systems, it has become necessary to use emulators to play old DOS games. Jazz Jackrabbit™ deserves more - and would benefit greatly from new features.
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.
History
OpenJazz was started on the 23rd of August, 2005, by Alister 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, 2006. Since then, a variety of ports have been released by other people. A lot of them have since been merged back into the main code base. More academic pressures meant there were few updates over the following few years, but in 2009 a multiplayer version was released. After that, more eye candy features have made it into the engine. These are features not directly involving the levels. However, without bonus levels, movie playback and the menu plasma effect, OpenJazz would be incomplete. In 2014, the project has been moved to GitHub to allow others to easily propose changes, report bugs and also fix them. This also lead to more ports being made. Nowadays, development has slowed down. The original author is involved with other projects and there is no clear roadmap for new features, besides striving for a "true" and faithful Jazz Jackrabbit™ adaption on all possible platforms. GitHub user carstene1ns has cleaned and restructured parts of the code base, integrated some ports and tries to resolve bug reports.
License
OpenJazz is available under the GNU General Public License version 2 or later, see licenses.txt for additional information and other included software.
Controls (See manual)
Building
Running 
Execute OpenJazz. Depending on the platform and compile time options, the
data files are expected to be under different paths (alongside the executable
works always as a general fallback). You can also specifiy a game folder as
command line argument.
Authors
Original author: Alister Thomson (alister_j_t at yahoo dot com)
Additional Authors (See manual)