Doomsday Engine (skyjake/Doomsday-Engine on GitHub) is an open source, cross-platform enhanced engine built around id Software's classic titles, including Doom, Heretic and Hexen. It preserves the original gameplay while adding modern rendering, controller support and quality-of-life improvements for PC players revisiting these shooters.
A new commit (aa09feba6449efe3b426013a71499bf7c310de15) has landed in the project's repository, marking continued active development on the engine. No further details on the change were provided in this update, but it confirms the project remains under ongoing maintenance.