Dhewm3 is an open-source port of the Doom 3 GPL source code, targeting modern PC platforms. It aims to keep the classic 2004 id Software shooter running cleanly on current hardware and operating systems, fixing issues that have crept in as platforms evolved.
The project builds directly on the code id Software released under the GPL, making it a faithful base for preservation and modding. A new commit has landed in the repository, continuing active development on the port.