Free heretic software for linux

gsQuery project is a PHP library that can query various game servers.
It allows you to query various game servers for things like number of players, the players itself, current map, etc. It also includes a ready to use example for non-PHP-aware people.
Games supported by "gsQuery":
- Unreal Tournamnet and most mods (gameSpy)
- Unreal Tournamnet 200x and most mods (gameSpy)
- Battlefield 1942 and most mods (gameSpy)
- Halflife and most Mods (hlife)
- Americas Army (armyGame)
- Quake 3 and some Mods (q3a)
- Star Trek: Elite Force (q3a)
- Medal of Honor Allied Assault (q3a)
- MoHAA: Spearhead/Breakthrough (mohs)
- Return to Castle Wolfenstein (q3a)
- Vietkong (vietkong)
- Rainbow Six: Raven Shield (rvnshld)
- Call of Duty (q3a)
- Battlefield Vietnam (gameSpyQ)
- Quake 2 and most mods (q2)
- Kingpin (q2)
- Sin (q2)
- Farcry (farCry)
- IGI2: Covert Strike (igi2)
- Jedi Knight 3 (q3a)
- Solider of Fortune 2 (sof2)
- Far Cry (farCry)
- Quake 2 (q2)
- Kingpin (q2)
- Heretic 2 (q2)
- Halo (halo)
- Deus Ex (deuxEX)
- Doom 3 (d3)
- Halflife 2 (hlife2)
- CS:Source (hlife2)
- Savage: The Battle For Newerth (savage)
- StarWars BattleFront (gameSpy)
- And probably more

Yadex project is a Doom/Doom II/Heretic level (wad) editor for X.
Yadex is a Doom level (wad) editor for Unix systems running X, including Linux. It supports Doom alpha, Doom beta, Doom, Ultimate Doom, Final Doom, Doom II, Heretic and also, in a more or less limited way, Hexen and Strife. It is available under the terms of the GPL.
Yadex is descended from DEU 5.21. Therefore, as you might expect, its a rather low-level editor that requires you to take care of a lot of detail but on the flip side allows you to control very precisely what you are doing. In addition, it has many advanced functions that DEU didnt have, to make certain tedious tasks easy.
Enhancements:
- Build: The configure script autodetects the C and C++ compiler (cc, c89 or gcc and c++, cxx or g++). To skip the detection and force a particular value, use the --cc and --cxx options.
- Code: Minor warningectomy. Fixed potential uses of uninitialised pointers if wad I/O errors occurred while reading the texture list.
- Editing: Improved the handling of superimposed objects.
- The linedef object info box now lists any superimposed linedefs (up to seven). No such feature for vertices, sectors and things, mainly because it doesnt seem to be as big an issue and Im lazy.
- When the pointer is over more than one object, its now the highest-numbered one thats highlighted and not the lowest-numbered as it used to be. Thus the highlight and the info box match the display (that shows the highest-numbered object and always has), which should be less confusing. Highlighting the highest-numbered object seems to be the right thing too, since the object you created last is the one youre most likely to want to edit or delete. This change only affects vertices, linedefs and things. For sectors, the code hasnt changed.

Wad2PDF examines wad files and prints an overhead picture of all levels to a PDF file.
Wad2PDF is a program that converts the levels in Doom wad files into PDF files. The result has a birds eye view of every level, with floors neatly texturized and all items in the level in their proper places.
The PDF output can be imported to graphics programs for further editing or printed out directly. You can even create wall-sized mega posters of your favorite Doom levels.
Main features:
- supports all Doom games: Ultimate Doom, Doom II, Heretic, Hexen, and Strife
- full pwad support
- creates browsable PDF with bookmarks identified by level names
- reads gl nodes both from wads and GWA files
- resulting PDF is vectorized and can be zoomed arbitrarily (extreme zooms will make the textures blocky, though)
- available under the GPL
- does not support hi-res graphics or scaled/zoomed flats