D3wasm is described as 'Experiment to port the id Tech 4 engine (aka. “Doom 3 Engine”) to Emscripten / WebAssembly and WebGL, allowing to run games such as Doom 3 inside modern Web Browsers' and is an app. There are four alternatives to D3wasm for Windows, Linux, Mac, Flathub and Flatpak. The best D3wasm alternative is fhDOOM, which is both free and Open Source. Other great apps like D3wasm are dhewm3, UQE Doom 3 and RBDOOM-3-BFG.
Modernized DOOM3/idTech4 engine: ported to modern OpenGL (core profile), enhanced visual effects, improved performance, improved editor, more to come.
fhDOOM is the most popular Windows alternative to D3wasm.
fhDOOM is the most popular Open Source & free alternative to D3wasm.
dhewm 3 is a Doom 3 GPL source port, known to work on at least Windows, Linux, macOS and FreeBSD.
dhewm3 is the most popular Mac & Linux alternative to D3wasm.
UQE Doom 3 is a source port for Doom 3 that primarily focuses on quality of life improvements such as wide-screen support.
RBDOOM-3-BFG is based on DOOM-3-BFG and the goal of this port is to bring DOOM-3-BFG up to the latest technology in 2021 making it closer to Doom 2016 while still remaining a DOOM 3 port regarding the gameplay.
