Support for Dota 2 has now been added. A link to the download is in the first post.
If you'd like to run a server for it, it is highly recommended to install the latest
snapshot of Metamod:Source and the
Dota 2 Fixups plugin in order to fix a number of issues. MM:S must be installed using the
gameinfo.txt installation method.
More details may be found in a new thread specifically for Dota 2 dedicated servers running on all platforms (Windows, Linux, and OS X):
https://forums.alliedmods.net/showthread.php?t=236635