This plugin is able to operate without issues (Give or take some functions since some armature types don't need them) on a numerous amount of armature types even if they're not even Valve games. The full list of compatible armatures are as follows:

Gold Source Armatures

• Full support

Source Armatures

Left 4 Dead 2

• Full support

Garry's Mod

• Full support

Team Fortress 2

• Full support (Except face expressions for now)

Titanfall Armatures

• Full support (Except face expressions)

Source 2 Armatures

S&Box

• Full Support (Except face expressions)

Notes

Since most mods use the standard armature naming scheme (Half Life 2/Garry's Mod), it's likely that it'll work on most of them, but if there is one that it does not work on, do mention it to me and i'll add support for it.