imjohnblue's Stars
Interkarma/daggerfall-unity
Open source recreation of Daggerfall in the Unity engine
TokisanGames/Terrain3D
A high performance, editable terrain system for Godot 4.
atmosgames/SuperSimple2DKit
A simple kit meant to help jump start the creation of your 2D Unity game!
orx/orx
ORX: Portable Game Engine
UnderminersTeam/UndertaleModTool
The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)
adventuregamestudio/ags
AGS editor and engine source code
bradharding/doomretro
The classic, refined DOOM source port. For Windows PC.
wipeout-phantom-edition/wipeout-phantom-edition
An enhanced PC source port of the original WipeOut.
Aleph-One-Marathon/alephone
Aleph One is the open source continuation of Bungie’s Marathon 2 game engine.
ericwa/ericw-tools
Quake/Hexen 2 Map compiling tools - branch of http://disenchant.net/utils
torcado194/scritch-player
A simple, customizable HTML media player designed for artists
jonathanlinat/quake-leveldesign-starterkit
A starter kit to consolidate various tools and resources into one comprehensive package, facilitating the quick and easy creation of Quake and GoldSrc engine-based maps with just a few clicks.
Blasphemer/blasphemer
new home for the Blasphemer IWAD
Ryochan7/FakerInput
blendogames/fna_starterkit
Starter kit for the FNA game framework.
Drugod/BloomProject
Official BlooM project repository for Doom II & GZDoom / Zandronum
nzmichaelh/gbdk
Game Boy Development Kit mirror
HandsOfNecromancy/HandsOfNecromancy-Engine
BenMcLean/Baron-Von-Evil
Baron Von Evil's Mansion is a psuedo-3D maze game written in QBasic using text for graphics.
eclecticanimal/ags
AGS editor and engine source code