I am proud to announce that Metamod:Source versions 1.4.3 (Source) and 1.6.0 (Orange Source) have been released. As of these versions, Metamod:Source no longer needs a "gameinfo.txt" modification. For more information on how to migrate to the new loading mechanism, see the documentation. The old method, of course, will continue to be available.

Metamod:Source is a C++ plugin environment for Half-Life 2. It acts as a "Metamod" (a term coined by Will Day) which sits in between the Game and the Engine, and allows plugins to intercept calls that flow between. It provides a mechanism called SourceHook, a very powerful library for intercepting, overridding, and superseding virtual function calls.

In addition, we've also added Metamod:Source VDF Files, which let developers distribute plugins that automatically load without any extra Metamod:Source configuration. We hope that these two usability changes will improve Metamod:Source's ease of installation with end-users, and decrease the documentation and installation complexity on behalf of plugin developers.

Metamod:Source's new loading mechanism has been tested against all major plugins. However, there are rare cases where a plugin might be incompatible. If a plugin stops working with the new loading mechanism, or you're a developer concerned about the changes, please see our Gameinfo Deprecation article.

More info and the downloads for server admins over here.

With this release out of the way, SourceMod 1.0.0 will be able to follow soon.