The open source Zircon engine ("DarkPlaces Mark V Project") is a modification DarkPlaces engine with a mouse driven menu everywhere, ALT-ENTER fullscreen/windowed switching and 88 other enhancements to support user/mapper/mod coder ease-of-use and optional conveniences for those interested in a "1996 Quake" experience. "csqc_full_width_height 1" in console when running Arcane Dimensions at this time It is hoped that some/many/all of these enhancements will eventually make it into official DarkPlaces. The Zircon engine seeks to keep full compatibility with DarkPlaces so either engine can be used interchangeably.
The Quake 1 map compiler that comes with J.A.C.K. is slow (use ericw tools, included). The J.A.C.K. quake.fgd does not have sprites for info_player_start, info_player_destination and many others. This is an attempt to address those issues. Included: ericw tools (current version), a new sprites.pak to put in the J.A.C.K. folder replacing the existing one -- this sprites pak has new sprites -- and an improved .fgd file that uses those sprites.