Hong Kong Game Cartridge Co., Ltd. made at least 8 NES carts. These are all pirates of various Famicom games, and they are all single game carts, oddly enough (they decided not to go down the multicart route like everyone else). Plus, all of the label art is original, and extremely cheesy.
The cart above is for Field Combat, aka Commando. The other 7 known carts are below (you may want to wait a little while for the loading... hehehe).
Milon's Secret Castle