Modifications and Add-Ons

Action Quake 2: The Next Generation
One of the most used Action Quake2 variant in Europe and Australia/New Zealand. Successor of the German PGBund Edition and the British Barrysworld Millennium variant.
http://aq2-tng.sourceforge.net/

Bot _Leaders Quake 2 Help Site
Help site, downloads and cheats.
http://www.geocities.com/bot_leader/index.htm

Echon.org
OpenGL-only engine modification designed to improve the game with technologies such as shaders and advanced particle effects.
http://www.echon.org/

The Gloom Map Depository
Maps, information, news, and reviews.
http://www.planetgloom.com/gmd/

Jake2
The Quake 2 engine ported to Java. Includes screenshots, downloads and progress reports.
http://www.bytonic.de/html/jake2.html

Lair of Doodle Dang Wang
Includes modifications and maps.
http://www.geocities.com/doodledangwang/dangwangplace.html

Lithium II
A server-side mod. Includes downloads, news, a FAQ and a web board.
http://www.planetquake.com/lithium/

Mod Central
Includes mod news, reviews, interviews, and guides.
http://www.planetquake.com/modcentral/

NIQ (No Item Quake)
Server-side mod which completely removes all items from the game. The server controls which weapons all players have, making the game play emphasize fighting skills.
http://www.planetquake.com/niq/

Planetgloom
Includes maps, downloads and a forum.
http://www.planetgloom.com/

QBism
Modifies Quake 2 source code via the QFusion project. Uses Quake 3 format media maps, models, and shaders.
http://qbism.com/

QPong
A modification based on Pong. Includes downloads, screenshots and a forum.
http://www.planetquake.com/teamreaction/qpong/index.shtml

Q-Racing
Race Micro Machines cars.
http://www.telefragged.com/flitsoft/

Quake2 Cluster Project
Project to develop a common API among Q2 mods. Includes downloads and a mailing list.
http://www.planetquake.com/logic/

Quake2 COOP or DIE
Multiplayer Quake2 cooperative mode with monsters, online account and persistant data.
http://www.coopordie.com/quake2/

r1ch.net anticheat
An anti-cheating system for Quake II designed to stop all known hacks. Works with three popular Quake II clients to provide a fair gaming environment for everyone.
http://antiche.at/

R1CH's Quake 2 MODs
Includes project information and downloads.
http://www.r1ch.net/q2/

Roll Your Own
A program designed to create mods. Includes downloads, a forum and mod information.
http://tarot.telefragged.com/ryo/

R1Q2
Engine modification focusing on providing a secure, stable and high performance client and server.
http://www.r1ch.net/stuff/r1q2/

TagYerIt: One Against Many
A server-side deathmatch mod. Includes mod information and downloads.
http://www1.shore.net/~steqve/qm/tagyerit.html

Tenebrae
A modification that adds stencil shadows and per pixel lights to Quake. Includes downloads, screenshots and progress reports.
http://tenebrae.sourceforge.net/

Vortex
Deathmatch and Capture the flag where players build a character by gaining experience points.
http://www.planetquake.com/vortex

Weapons of Destruction Info Page
Information and FAQ for "Weapons of Destruction", a Quake 2 modification.
http://nettrash.com/users/kosh/wodinfo.htm

Weapons of Destruction Xtreme
mod with customizable weapons and powerups
http://www.netdoo.com/wodx/

Window Of Retaliation
New episode for Quake2. Includes 9 new levels, new weapons, some new enemies and a few puzzles. Can also be played in DM.
http://www.planetquake.com/roseville/