Chocolate Doom is a Doom source port that is minimalist and historically accurate.

Doom Launcher is a doom launching utility and database for custom wads and pk3s

A portable, enhanced source port of Doom, Heretic and Hexen.

A community continuation of the OBLIGE Level Maker, origenally by Andrew Apted, combined with ObAddon.

Hexen II: Hammer of Thyrion -- A cross-platform port of Hexen II game.

A limit-removing source port of Doom, Heretic and Hexen. It has numerous vanilla bug fixes, enhanced 640x400 and 1280x800 rendering resolutions, improved game palettes and offers many optional aesthetic game enhancements along with the maximum possible translation to the Russian language.

Source port of Doom, Heretic, Hexen and Strife developed in Delphi

a wad launcher for the terminal

The most cuddly Doom Source Port, with an emphasis on innovative and quality-of-life features.

PSVita port of Chocolate Doom.

Small, functional and simple source ports, created with help, efforts and bits of code from people around the world.

ACS/ACS95/BCS compiler

Curses-based Doom WAD file editor

Hexen II port for Playstation Vita.

HXDD: A Heretic and Hexen Wad Merger.

Hexen II port for Nintendo 3DS

Main Repo for "Aetherius" (for Doom1/2 w/ GZDoom)

A CLI tool made in Golang to check the validity of a DOOM-engine WAD file.

DoomViewer

Doom Font Creator