Plug in any combo of up to 4 NES, SNES, or N64 controllers, use them as USB HID joysticks.
A Nintendo Advantage-inspired controller to use with the NES Classic Edition or Wii (but for 2-button games).
Using a Silicon Labs F327 toolstick you can convert an NES controller to use USB!
A portable NES Emulator (runs on EPS32) in an NES Controller. Up to 14 ROMs and 2.5h playtime, all for less than $25.
A simple Tessel library for interacting with the original Nintendo controller
Build your own oversized game controller using conductive tape, push buttons, and a ton of LEGOs.
Tessel code for connecting a NES controller / joystick