Valve Community

Valve-ERC Forums is a forum for mapping and modding, focusing on Source and GoldSource issues. The Half-Life 2/Source section is outdated because it moved to a sub-forum of the SteamPowered forums.

TF2 Forum is the center for discussion, game strategy, and resources for Team Fortress 2. You can chat with the community, or take a look at their information sections.

TotalHL.hu is a Hungarian Half-Life portal.

Mods Online is a news and community forum, with a very active user base.

Combine Destiny is the home of the Combine Destiny 1 and 2 mods for Half-Life 2.

The Cinematic Mod (CM) is a Half-Life 2 modification, that adds more details and a darker look to the original Half-Life 2 series.

Planet Fortress is IGN’s portal for all things TF. It is more of a reference site than a regularly updated center.

CommunityFortress.com is a fansite for Team Fortress 2. They provide coverage of competitive leagues and tournaments with a focus on personal interviews with the best in the TF2 community. In addition to their coverage, they host TF2 forums geared for the competitive player, a competitive TF2 wiki, and have community writers contributing TF2 predictions.

World Of Level Design is a website/blog aimed at those interested in Environment Art and Game Level Design. It contains plenty of original content, including tutorials, articles and interviews. There is also a lively forum.

Geek-Gaming is a French site that mainly seems to cover TF2, with the occaionsal review of Half-Life 2, EP1 and EP2 sp mods.

Games Modding is a site that covers many aspects of making mods for various games. It features, tutorials, interviews and forums. Updated regularly, the crew of this site are working hard to provide interesting and original content.

Games Modding is also a PlanetPhillip.com file partner.

TF Portal.Net is a joint English and German website cover all the Team Fortress games.