Custom Export Plugins

Hey all,
I use Blender for making custom models and things for games. Problem is, Blender can’t export in many of the file formats I need? Do you know if there is somewhere I can download plugins to export in md3 (for Quake 3, .map isn’t the model extension) and .mpk (for Painkiller, as the built-in editor doesn’t support level geometry). Thanks!

EDIT: Btw, before you all direct me to the page that shows up when you google “blender export md3”, the link’s dead. And I found how to do the Painkiller bit.

EDIT EDIT: God, I really do apologize. I need to search more before I post. Anyway, I found this: What do I do with it? Where do I put those .py files?