The Arc-Controller is compatible with about any Arduino, or other micro controller such as Raspberry Pi. It runs an ATMega328, and is user programmable via the Arduino IDE.

New Arduino Esplora Provides A Ready-For-Gaming, Customizable, Open Source Video Game Controller Darrell Etherington 5:59 AM PST · December 10, 2012 ...

Make Your Own Plush Game Controller Electronics maker Adafruit Industries has developed its own Arduino-compatible boards, including one called the Flora–and a few craft projects to go with them.