Add-ons are optional computer hardware or software modules that supplement or enhance the original unit they are adding on to. Also known as plugins, extensions, snap-ins, or various other vendor-specific names, these modules often have proprietary interfaces that are tightly held by the company that manufactured the original unit in order to prevent competing companies from producing add-ons.
For example, a network switch may ship with an unoccupied but non-standard port to accommodate various optional physical layer connectors, while games and productivity applications often use plug-in architectures which allow original and third-party publishers to add functionality. Web browsers use plug-ins to enable the presentation of new content formats without modifying the underlying web browser.
Manufacturers can use add-ons can to create vendor lock-in by limiting upgrade options to only those available from or endorsed by the original manufacturer. IBM's Micro Channel architecture, technically superior to Industry Standard Architecture as a way to add components to IBM PCs, largely failed to gain wide support due to the difficulty in getting certification for third-party devices.
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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 Millenium variant.
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Axis Productions - Includes mod information, a forum and downloads.
Meta Description: [ Planet Quake is the epicenter for news on all Quake games, especially the upcoming Quake Wars. If you love
the Quake 1, 2, 3, 4, or 5 engine - we have the latest reviews, guides
and more ]
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Cry Havoc - Includes mod information, downloads and install information.
Meta Description: [ Planet Quake is the epicenter for news on all Quake games, especially the upcoming Quake Wars. If you love
the Quake 1, 2, 3, 4, or 5 engine - we have the latest reviews, guides
and more ]
Echon.org - OpenGL-only engine modification designed to improve the game with technologies such as shaders and advanced particle effects.
Meta Description: [ Echon.org ]
Jake2 - The Quake 2 engine ported to Java. Includes screenshots, downloads and progress reports.
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L-Fire - Includes news, downloads, history and a forum.
Meta Description: [ Planet Quake is the epicenter for news on all Quake games, especially the upcoming Quake Wars. If you love
the Quake 1, 2, 3, 4, or 5 engine - we have the latest reviews, guides
and more ]
Lithium II - A server-side mod. Includes downloads, news, a FAQ and a web board.
Mod Central - Includes mod news, reviews, interviews, and guides.
Meta Description: [ Information on mods for Quake II, Unreal, SiN, Half-Life, Shogo, and more. ]
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.
Planetgloom - Includes maps, downloads and a forum.
Meta Description: [ planetgloom.com - Your one source for everything for the Quake 2 Gloom mod by Team Reaction! Download gloom, catch the latest news and grab all the custom maps you'll need here. Also home to numerous documents such as the server admin guide, client commands, mapping help as well as the lively Glo... ]
Q-Racing - Race Micro Machines cars.
QBism - Modifies Quake 2 source code via the QFusion project. Uses Quake 3 format media maps, models, and shaders.
QPong - A modification based on Pong. Includes downloads, screenshots and a forum.
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Quake II QPong Fan Site - Maps, files, news, and information about Quake II's QPONG modification.
Quake2 Cluster Project - Project to develop a common API among Q2 mods. Includes downloads and a mailing list.
R1CH's Quake 2 MODs - Includes project information and downloads.
R1Q2 - Engine modification focusing on providing a secure, stable and high performance client and server.
Roll Your Own - A program designed to create mods. Includes downloads, a forum and mod information.
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Superheroes for Quake2 - Includes downloads and mod information.
Meta Description: [ Planet Quake is the epicenter for news on all Quake games, especially the upcoming Quake Wars. If you love
the Quake 1, 2, 3, 4, or 5 engine - we have the latest reviews, guides
and more ]
TagYerIt: One Against Many - A server-side deathmatch mod. Includes mod information and downloads.
Tenebrae - A modification that adds stencil shadows and per pixel lights to Quake. Includes downloads, screenshots and progress reports.
The Gloom Map Depository - Maps, information, news, and reviews.
Meta Description: [ The Gloom Map Depository - #1 Source for All Gloom Maps, All the Time ]
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Viking DM/CTF mod - Server-side mod that includes highscore list, Eraser bot support, offhand grapple, and item banning.
Meta Description: [ Planet Quake is the epicenter for news on all Quake games, especially the upcoming Quake Wars. If you love
the Quake 1, 2, 3, 4, or 5 engine - we have the latest reviews, guides
and more ]
Vortex - Deathmatch and Capture the flag where players build a character by gaining experience points.
Meta Description: [ Planet Quake is the epicenter for news on all Quake games, especially the upcoming Quake Wars. If you love
the Quake 1, 2, 3, 4, or 5 engine - we have the latest reviews, guides
and more ]
Weapons of Destruction Info Page - Information and FAQ for Weapons of Destruction, a Quake 2 modification.
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.
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