This is a HexenWorld serverside mod, nowadays used by most HexenWorld servers instead of the original 0.15 progs, includes character balancing changes, some bug fixes, new features like chasecam and grappling hook.
http://www.planetheretic.com/nikz
Dedicated to the development of quality deathmatch and teamplay mods for Hexen II like HexMatch, Capture The Flag and tips on how to make good CTF levels.
http://www.planetheretic.com/hexdev
As the authors of this mod put it, this is "First Person Warcraft". There are 2 teams, the attackers and defenders, with the object to break into the castle and steal the crown resp. to defend the crown at all price.
Siege also features character class modifications, like special attributes and spells. There are also 2 all-new character classes, the Succubus and the Dwarf.
The site has also a lot more info like strategy tips and a collection of Siege stories.
http://www.planetheretic.com/siege
Couldn't find out though where to download the files. If you know of a place, please share it with us.
This mod is based upon another Hexen II mod, Siege (see above). What the planned differences would have been is anyone's guess as it was never finished.
http://www.planetheretic.com/siege/assault
Another conversion of Siege. The main difference is that (like in Capture the Flag) you have to both attack to steal the enemy's crown and at the same time defend your own castle and crown. It also features 2 new character classes: Gol'am the Troll and The Femme Warrior.
http://www.planetheretic.com/kingdoms
Nowadays most 3D shooters implement this multiplayer game type, but for Hexen II you need this mod to be able to play CTF. For those who don't know the rules, there are 2 teams. Each has a base with a flag. The goal is to capture the enemy's flag and bring it back to the own base. A team can score a point by bringing back the enemy flag to the base when the own flag is there as well.
http://www.planetheretic.com/hwctf
http://hexenworld.raven-games.com/hwctf
Your goal is to capture (kill) enemy players. Once you frag a foe, he/she will be transported to your prison and await death, unless rescued by teammates. Does one of the teams succeed in capturing all players of the opposing team, the captured are all put to death and the winners score big way.
http://hexenworld.raven-games.com/dungeonbreak
This is a modified version of Deathmatch. At any given time, only 2 players fight to death, the others are in the waiting line as spectators. This mod has been based upon the Rocket Arena mod of Quake. If you've ever played Tournament in Q3A multiplayer, you know this game type already.
http://www.planetheretic.com/hexarena