DarkPlaces has beautiful weather features such as rain, snow and fog.
Darkplaces uses a variation of Phong shading as a default lighting model.
This explains how to create your own skybox using Terragen.
Quake MDL is the most basic original model format used in Quake.
Let's say you downloaded a bunch of textures from the internet. Some of them are JPG, some are PNG or even TGA. That is uncomfortable and may cause trouble when importing inside the game. It's good practice to cast all textures to the same format.
List of all Quake DarkPlaces console variables (CVARs) and commands (CMDs) with description.
A brief explanation of what NAT, DMZ are, how packet filtering works, and more.
Fimg is an image editor for sprites and similar assets in Quake by FrikaC for Windows.
Pack of utils to extract WAD file from Half-life or Quake BSP. This includes TExtract suite, wintextract, textract, BSP2WAD.
QPakMan is a command-line (text only) program for managing the PAK and WAD files used by the games Quake, Quake II and Hexen II.