Who Dares Wins
- Total conversion mod focused on post-Vietnam (post-1975) era special operations warfare. Screen shots, weapons, units, maps, and forum.
- http://www.wdwmod.com

Annihilation
- A roleplay modification for Half Life 2. Includes screenshots, a map, forums, and back-story.
- http://rpa.planethalflife.gamespy.com//abalos/

Exterminatus : Rival Species 2
- A Warhammer 40,000 themed total conversion. Sequel to the Rival Species mod for Half-Life.
- http://www.40ksource.com/

Source Sprays
- Half-Life 2 and Counter-Strike: Source spray logos. Includes tutorials and a forum for submitting custom sprays.
- http://sprays.hlgaming.com/

No More Room in Hell
- A multiplayer co-operative zombie modification for Half-Life 2. Includes forums, trailers and screenshots.
- http://www.nomoreroominhell.com

Half-Life 2.net
- Information on maps and modifications. Includes strategy guides.
- http://www.halflife2.net/

Half-Life 2 Coding
- A programming community including tutorials, articles, challenges, forums and news.
- http://www.hl2coding.com/

HL2 World
- Provides news and information concerning Valve's Half Life 2 and a community supporting the game and its modifications.
- http://hl2world.com/

Half-Life 2 Mods Community
- Community forums for custom mods, downloads, SDK assistance, and other information.
- http://www.halflifesource.com/mods

Half-Life 2 Modding
- Game and mod news, directory of mods organized by type, cheat codes and CVARS.
- http://efx.endoria.net/

Forsaken
- A multi-player urban warfare mod for Half-Life 2 set in the year 2009; 3 years after a virus nearly erases human life on earth.
- http://www.forsaken-game.com/