Q-Zandronum is a fork of Zandronum, a multiplayer oriented port, based off Skulltag, for Doom and Doom II by id Software. The main goal of the fork is to improve the QC:DE gameplay, but it can be used with other mods as well. The engine brings improved netcode, multiple Quality-of-Life improvements and new modding features.

In some scenarios, commercial data files are required to run the supported games. In other cases, it's possibly to automatically use Freedoom as a drop-in replacement. This package comes bundled with Doomseeker for easy installation and server browsing.