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OpenTitus is a rewrite of the game engine used in the old DOS-based games Titus the Fox and Moktar (the French version). This project parses the data directly from the original game data files. The project is based on SDL and programmed in C.
A wiki is available at http://opentitus.wikia.com/wiki/OpenTitus_Wiki
If you do not own the original game already, you can purchase it at https://www.gog.com/game/titus_the_fox_to_marrakech_and_back
CloneKeen is an open-source clone of ID's classic DOS game Commander Keen. CloneKeen runs under many platforms including Linux & win32. There are some improvements over the original such as 2-player support. Original game data files are required.
FreeNukum is an approach to rewrite the engine of the Duke Nukem 1 (2D, EGA graphics) game. It will be possible to play the game using the original graphics and level data, as well as you can play using your own graphics an level data.
This is a top-down space-exploration game written in c++ using CodeBlocks and MingW. It uses Ogre for rendering and OgreOpcode for collision detection. The editing data files info is out of date, feel free to leave comments, crits, whatever here.
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Luciferino is a sidescroller game engine, that allows you to create your own sidescroller without any programming knowledge (you'll only have to read a pair of tutorials to understand the data files format).