ZDoom LE

ZDoom LE, also known as ZDoom Legacy Edition, is a of the ZDoom source port by drfrag. It is based off ZDoom 2.8.1, and in a separate fork, also includes a OpenGL renderer courtesy of GZDoom 1.8.4 with additional fixes. It focuses on updating the last ZDoom release with new features for older and legacy computers whilst maintaining compatibility with several mods, such as Brutal Doom.

History
ZDoom LE was released to bring new features to generally older hardware, allowing users to play mods beyond the latest ZDoom release on hardware that cannot support GZDoom or LZDoom. Starting from version 2.8.1a R2, an renderer was added, courtesy of GZDoom 1.8.4. ZDoom LE at this stage released in both software rendered and OpenGL based versions independently under the same 2.8.1 moniker.

This changed with ZDoom LE 2.8.1d, which saw the OpenGL version gotten raised to 2.8.2a. Since then, both subversions retain similarity in terms of feature set, but deviate in terms of version numbers. As of this writing, the latest versions are:
 * Software rendering only: ZDoom LE 2.8.1f, released February 14, 2019
 * OpenGL rendering: ZDoom LE 2.8.3a, released February 14, 2019

Features

 * All features from ZDoom 2.8.1 (ACS, etc) and GZDoom 1.8.4
 * Various patches and fixes for older mods
 * OpenGL 1.2 based renderer courtesy of GZDoom 1.8.4 (LE 2.8.x)
 * Colored lighting
 * MD2 model support
 * Restored renderer
 * Compiled with Pentium II architecture optimizations
 * Sprite and wall distance culling to improve performance
 * Low detail modes (2x2, 3x2, 4x4)
 * Quad horizontally and double vertically render modes
 * Options to switch between and  rendering (Worldsim, backend)
 * New, more retro looking startup console
 * Modernized keyboard layout
 * FluidSynth midi support
 * Support for IWADs created with WadSmoosh

Trivia

 * ZDoom LE requires the following: Pentium 133, 16 MB RAM, 1 MB card and Windows 95. For OpenGL mode a graphics card with GL 1.2 support is required.
 * Previous versions include 2.8.1a, 2.8.1a R1, 2.8.1 R2.