Skulltag

Skulltag is a source port by Brad "Carnevil" Carney, based on ZDoom with network code derived from Quake 2. Its gameplay has been described essentially as a hybrid of Quake 3: Arena and Doom.

Features

 * Supports most ZDoom features (deep water, skyboxes, transparent walls).
 * Client/server multiplayer architecture.
 * Customizable, dynamic bots.
 * Extra weapons, items, and monsters.
 * Medals to award achievements during multiplayer mode.
 * New multiplayer modes, including Capture the Flag, Last Man Standing, One flag CTF, Skulltag, Team Deathmatch, and Instagib.
 * DECORATE support for custom monsters.

New weapons

 * Minigun: Even faster than the chaingun, but has a cooldown pause when the trigger is released, and no first-shot accuracy.
 * Grenade launcher: Fires bouncy, explosive grenades that not only damage enemies on explosion but on impact as well.
 * Railgun: Fires hitscan slugs that can pierce multiple enemies.
 * BFG 10000: Unleashes rapid-fire, hitscan bolts with splash damage which can affect a large area. Based upon Quake 3: Arena's BFG10K weapon.

New items

 * Turbosphere
 * Time freeze sphere
 * Invisibility sphere
 * Doomsphere
 * Random powerup
 * Terminator
 * Strength rune
 * Rage rune
 * Drain rune
 * Spread rune
 * Resistance rune
 * Regeneration rune
 * Prosperity rune
 * Reflection rune
 * High jump rune
 * Haste rune

New monsters

 * Dark Imp
 * Blood Demon
 * Super Shotgun Guy
 * Cacolantern
 * Hectebus
 * Abaddon
 * Belphegor