ZDoom

ZDoom is a source port, originally based on ATB Doom and NTDOOM. It has since added full support for all commonly-used Boom additions, Heretic, Hexen, Strife and Chex Quest. It has added many additional features, including slopes, uncapped FPS rate, and z-clipping. The source code is maintained by Randy Heit and Christoph "Graf Zahl" Oelckers. The most recent version is, but many in the community use the development versions. The large number of features supported by ZDoom made it the port of choice for several independent game projects, notably Foreverhood, Action Doom 2: Urban Brawl and Chex Quest 3.

Features

 * Support for all of Hexen's editing features (including ACS, hubs, and new map formats).
 * Support for most of Boom's editing features.
 * Support for UDMF
 * Support for all Doom engine games: the various versions of Doom, Heretic, Hexen, Strife, Chex Quest and even Freedoom is identified as its own IWAD rather than being taken for Doom 2: Hell on Earth.
 * Removal of most vanilla Doom limits (including the visplane overflow).
 * High screen resolutions (with optimizations for modern processors).
 * Translucency (regular and additive).
 * A console.
 * Additional control options including crosshairs, mouse look, jumping and crouching configurable via Quake-style key bindings.
 * More music and sound formats: MOD, XM, IT, S3M, MIDI, OGG Vorbis, SPC, FLAC and MP3, as well as MUS.
 * Support for PNG, [Wikipedia:JPEG|JPG], TGA and DDS format images.
 * Greatly enhanced texture definition lump allowing scaled textures (for high-resolution), as well as compositing multipatch texture using independent rotation, mirroring, alpha transparency level and either translations or color blending for each patch.
 * Support for DECORATE script.
 * Limited UDP Internet or LAN networking inherited from Linux Doom.
 * Walking over/under monsters and other things.
 * Runs under Windows 9x, NT, XP, and Linux.
 * Support for Doom Connector and Player Connector network games.
 * Decals on walls for scorch marks and blood splatter.
 * Support for custom player skins.
 * Support for sloped floors and ceilings.
 * Many camera effects, including Duke Nukem-style security camera or Unreal-style skyboxes. Cameras can even replace the player view, allowing for scripted cutscenes or alternative gameplay mimicking a sidescroller.
 * Support for loading DeHackEd patches directly.
 * Support for friendly monsters.
 * Support for using features of every supported game in all of them -- for example, a Doom map can feature Strife conversations, Hexen scripting and actors that use Heretic codepointers.
 * Support for loading resources directly from ZIP or 7z files, making the use of the traditional WAD file optional.
 * ENDOOM and animated start up screen support

Ports based on recent versions of ZDoom
These ports support most or all of the features listed above.
 * GZDoom
 * Skulltag

Ports based on older versions of ZDoom
These ports are not necessarily compatible with recent ZDoom mods.
 * bZdoom
 * csDoom
 * Odamex
 * ZDaemon
 * ZDaemonGL
 * ZDoomGL