Mod Central

The best way to enhance the replay value of a game is to make a Mod or Modification of it using a theme from another game, a popular TV or movie, or even an original idea. Below is a listing of sites that carry Mods of the most popular PC games like Ghost Recon, Dungeon Siege, Half-Life, and Diablo. Take note that the majority of the Mods are free. 

ODD BOT - Very simple Bot for Half-Life and TFC.

Akimbot - A great bot for multiplayer Half-Life mods. 

The Mod and Bot E-Book 1.1 - Free e-book written for anybody interested in mods. To view it, simply unzip the file and click on the icon. This is a great tool to place on your desktop for whenever you want to look for a mod or bot. 

 

Diablo 2	Independence War	Serious Sam
Dungeon Siege	Jedi Knight	Star Trek
Ghost Recon	Neverwinter Nights	Tribes
Half-Life (including CS)	Quake Series	Unreal Tournament
Half-Life: DoD

Diablo2:

Diablo Series Resource Page

• The Ancients: Fury Within - Official site for that mod.
• Baldur's Gate - Official site for the mod of Baldur's Gate for Diablo 2.
• Camelot Systems - Includes MPQ 2K and MPQ Draft tools for Diablo 2.
• Dark Sky - Features the Dark Sky and Tides of War mods for Diablo 2.
• Darkness Weaves - Offers the Darkness Weaves and Dark Crusade mods.
• Diablo2Mods.com - Mods for Blizzards Diablo 2-LOD game. 
• Digibo's Eclipse - Official site.
• Eastern Sun - Official site.
• The Forge - Several Diablo 2 mods.
• Harry Potter - Official site of the Harry Potter mod for Diablo 2.
• Hell on Earth - Official site.
• Infoceptor 3.0 - Includes several mod resources for the older versions of Diablo 2.
• Klay's D2 Game Enhancer - Official site.
• New Dawn - Official site.
• The Phrozen Keep - Enormous selection of mods by various authors.
• Sanctuary Corrupted - Includes the Sanctuary Corrupted, Sanctuary in Chaos and Tough Guys mods for Diablo 2.
• Sir General's Rune Mod - Official site.
• Suicidal Tendencies - Official site.
• Tactics Central - Includes the Cold Fusion mod for Diablo 2.
• Teknokyo's Mods - Features the Ancestral Recall, Descendants of the Dragon and Natalya10X mods for Diablo 2.
• V & K Mods - Working on the Middle Earth mod for Diablo 2.

Dungeon Siege:

• Dungeon Siege Net Guide - Features tips, maps, siegelets, item lists, and downloads.
• UnderSiege.org - Resources on siegelets (player-created quests).

Ghost Recon:

Ghost Recon Resource Page

Half-Life:

• Admin Mod - Excellent mod resource for Half-Life with FAQs, plugins, scripting, and even a developer's conference in Germany.   
• BoCBot - Brain Of Combat - Bot for the major Half-Life mods.
• Borderline Studios - Developers of Russian Front, Suicide March, and the Secrets of War.
• Cl Metamod - Plugin manager that allows mod-like plugins to add functionality to the Half-Life client.
• Counter-Map - Reviews CS maps.
• Counter-Strike Official Site - Official site.
• Counter-Strike Center - Counter Strike news, downloads, and strategy guides.
• Counter-Strike Central - Offers a searchable map archive, articles, map reviews, chronicles, and a clan database.
• Counter-Strike Immortals - Includes tips and strategies.
• Counter-Strike Nation -Features articles, interviews, strategies, guides, and FAQs.
• Counter-Strike NZ - New Zealand CS fan site.
• Counter-Strike.Org - Contains a wealth of information on CS.
• Counter-Strike Maps - A collection of several CS maps.
• Firearms Half-Life - Site based on one of the major HL mods.
• Front Line Force - A combination of Counter Strike and Team Fortress Classic.
• Map Depot - Reviews and downloads of maps.
• Map Edit Tools - Includes a graphical and a text based editor for the map file format.
• Maps by Cooley - Several CS maps.
• Nemesis's Moonshine Maps - Various maps and tutorials.
• Oz Deathmatch - Version 3 ready for download.
• Poke646 - A sp mod with new weapons and more.
• Power Forces - Mod in the works that will allow players to use vehicles.
• Project-Timeless - A team-based mod.
• Science and Industry - A teamplay mod in which players assume the role of Security Officer in one of two rival corporations striving for domination in the cutthroat world of chemical weapons research and development.
• Scientist Hunt - Teams compete to kill the most scientists in three seperate modes of play.
• Who Dares Wins - A military-themed mod.

Half-Life - Day of Defeat:

• Day of Defeat - Official site.
• DoD Mapping -  Contains tutorials, downloads, and prefabricated tools.
• ZeroPing.com - Day Of Defeat - Includes maps, updates, articles, and clan listings.

Independence War:

• Buda 5 - Mod set in the Babylon 5 universe. 
• Independence War - Official site. 
• Starship Repulse - Offers  resources, articles, and downloads.

Jedi Knight:

• Mysteries of the Sith Skins - Phantom Menace skins, Darth Maul skin, and Jedi Knight editing
• Rbots - Project to create a multiplayer bot. 
• Special Forces - Terrorism-based total conversion. 

Neverwinter Nights: 

• Neverwinter Nights Module Reviews - Modules reviewed by GameOgre.com. 
• ALFA Server #36 Secomber Area - Provides information on the Secomber area of the Forgotten Realms world. 
• Atwa - Online persistent world for Neverwinter Nights.
• Eriadain - NWN module in the works.
• Faerun.net - Downloads and ranks of modules.
• The Free City of Blood - Module based upon an earlier long running paper and pencil RPG campaign.
• Gloomveil - An original work of interactive fantasy open to exploration by adventurers from far and wide.
• Greyhawk Adventures - Explore the persistent world of Greyhawk via NWN mods.
• NeverWinter Nights Zone - Custom maps, screenshots, forums, and a dedicated server.
• Norworld a NWN Project - Takes place on the world of Norworld.
• Psychothriller - A world based upon an earlier PK MUD.
• Shroud World - Campaign information.
• Troimoira's Fane - A campaign being created for NWN.
• The World of Eradain - Includes history, culture and maps of a campaign world in the making. 
• The World of Layonara - Includes history, maps and characters.
• Zykara - Uses the NWN Game Engine and Toolset along with the 
  3rd Edition D&D Game Rules to create an online game world 

Quake Series:

Quake Series Resource Page

• The Boomstick Joint - Reviews and Strategies - Map reviews for Quake 1 and Quake 2. 
• Capturization - Reviews CTF mods.
• Clandestyne Software - Free utilities for Quake-based engine games.
• CTF Bot Central - Bots and mods for CTF.
• Discs of Quake - A Quake mod based on Disney's Tron movie. 
• MatchMod - A server mod for Quake II and Quake III. 
• 5thD Team - Free gaming utilities, mods and maps for Quake I and II.
• IKQ QuakeC Mods - Downloadable QuakeC mods.
• Minako Quake - Anime-based mod with new weapons.
• PlanetQuake hosted mods - Features DM, SP, and teamplay mods.
• Quake Matrix -  Mod based on The Matrix.
• Threewave CTF - Popular Capture the Flag mod. 

Serious Sam:

• Runes of Babylon - A team-based mod.
• Serious Editing - Includes mods and tutorials.
• Seriously! - News, articles, screenshots, downloads, game information, and mods.
• Starship Troopers - Mod based on the film Starship Troopers.

Star Trek Elite Force:

• Elite Force Modding Central - Information regarding mods and modding. 
• Elite Force Skin Tutorial - Tutorial on how to make skins for the game.
• Hazard Team Qualification - Mod ready for download.
• The New Hope - Features a story, pictures, and files.
• O'Brien's EF MODs and MAPs - Includes self-made maps and modifications.
• The Return - Mod based on a book by William Shatner.
• Steve's Maps and Mods - Contains maps and program enhancements for the game.
• Stukatto's Maps - Includes maps and a forum.
• Swat Center -Features skins and maps.

Tribes:

• HaVoC - Official site. 
• Mappers Mod - Helps make mods for tribes. 
• Ultra Renegades - Official site. 
• Poker's Pockets - Features the BWAdmin mod 
• Tribes Voice Pack Downloads - Provides self-installing voice packs.

Unreal Tournament:

• Action Unreal Tournament - Mod with an action film theme.
• Dark Magic - Adds spells to UT.
• Doctor Schwa's UT Laboratory - Scavenger hunt mod.
• Marathon: Resurrection - Total conversion of Bungie's Marathon.
• Modsquad - Provides information on modifications and mutators.
• MultiTeam CTF - Capture the Flag mod.
• Mutation - Reviews mutators.
• Pearman - Quirky UT mod.
• Rocket Arena : UT - Rocket Arena mod for Unreal Tournament.
• Strike Force -  Military themed total conversion of UT.
• Team Delta - Counter-terrorism modification.
• Unreal Center - Supplies several mods.
• Unreal4Ever - Futuristic science fiction mod.
• UnrealTower - Features mods such as Monster Madness, External Sniper, and Sticky Grenades.