HL2Spain is a Spanish fan-site and gaming community covering everything about the Steam Platform, Valve Games, and Source Engine based Games & MODs. It includes news, reviews, previews, manuals and tutorials done by their team and the community itself.

HL2World.com is a news and forum based site that has been around for a long time. The forum is particularly active.

LanManiaX2 is a map and mod resource. But don’t let that simple description fool you, it contains a wealth of news and information.

Leak Free is a Source engine development community started in 2004, which consists of useful tutorials and a helpful community to answer all of your level design, modeling, and programming questions. One of the most noted features is the Valve Hammer Editor Error Listing, which describes all the errors in the software and how you [...]

Level Architect is the personal portfolio of Anthony Nichols.

Map-Factory is a database hosting custom maps for any FPS. If you’ve make a map or simply came across a good map, feel free to submit it! If not, then just navigate through the site and you’ll find a lot of good maps!

Mod DB is the largest website dedicated to supporting independent development of games

N00b Salad is an online gaming community, “For the players, by the players”

Netday is dedicated to custom maps of high quality only. Maps are added regularly (at least one per week). It also covers mods like Dystopia, Portal Prelude and JailBreak. The map reviews are both in English and in French. It is advert free and features direct download to all files.

Planet Half-Life is the daddy of them all. It’s been online longer than most and is generally updated daily.

Podcast 17 is a weekly verbal tour of the Half-Life community. It covers everything related to the Half-Life universe and features lively, informative recordings.

Sammy Servers lists servers to play Zombie Master and a few other mods and games.