Zircon Beta Release #3 (Win64 binary, source code) file
"tool_marker" will make a spot on the map always visible with a marker (helpful for marking a location and finding it, like tool_marker "-3622 -438 124"). Replacement textures for textures | mapname | cop3_4.tga is now honored. Fence textures in .mdl...
Darkplaces Mark Arcane Dimensions Zircon Enginea Darkplaces Markv Project Mod For Quake Ircon Beta Release 3 Win64 Binary Source Code Evelopment Tools
Source: moddb.com