Source SDK for Linux
Mods are an important aspect of Valve's game lineup. Their nature makes it possible for a game to be developed that would not otherwise be created by a big -- or even a small -- studio.
That is why it's important to see Source SDK (namely Base 2006 and 2007) be ported to Linux. There are many good reasons why.
Game mods are fun to work at; and happen to suit Linux users very well. They can provide a positive, inclusive development community for any who are interested in participating. It is here that they can further garner a closeness between player and developer; something already found in the Linux community.
* And of course, it is well known that Linux is full of individuals who like to code, tinker and program, with many artistic types as well.
Additionally, mods can (and have) provide(d) prototypes for new, independent creations. Their turf are valuable testing grounds, instrumental for growing and gauging their popularity.
Look at the games that have gone from being Source mods to successful standalone titles: the Counter-Strike, Left 4 Dead and Team Fortress series. Then look at some of the beautiful independent creations, such as Garry's Mod and Dear Esther. Consider some of the other groundswell successes too, like Black Mesa. And of course, there are the varied communities enjoying other Source mods all around the internet. (for example, one of my favorites is GoldenEye: Source)
The Source mod is an important part of what Valve has to offer compared to other video game companies. Some players even play these pretty much exclusively, passing on Steam's catalogue of AAA titles.
In addition to the wonderful ports to Linux such as Half-Life and Counter-Strike, Source SDK should be taken just as seriously as the AAA title for its many valuable aspects.