There were many NES and Famicom developers back in the day including some that were not lisensed with Nintendo. There were two main reasons for this the main one being expense, Nintendo charged a lot of money for lisences. The other reason is quality control, if companies like Sachen and Color Dreams were lisenced not many if any of their games would of hit shelves.
UNLISENCED PUBLISHERS / DEVELOPERS
American Game Cartridge Inc
A quick look at the unlicensed sub-division of Sharedata AGCI.
Color Dreams
Unlicensed company that later divided into Bunch and Wisdom Tree.
Home Entertainment Suppliers (H.E.S)
HES published unlicensed Sachen, Bit Corp, Tengen, AVE, and AGCI games in Australia.
Sachen
Unlicensed Taiwan based company who released many Famicom and NES games.