PointShop by _Undefined
PointShop is a shop system for Garry's Mod 13 developed by _Undefined. The original version was created over 2 years ago in November 2010, and has now been re-created from scratch for Garry's Mod 13 with a few new features.
See http://pointshop.burt0n.net for more information.
Feel free to send a pull request.