OpenPanzer.org Scout ESC features the Atmel ATmega 328 microcontroller and VNH2SP30 motor drivers:

Dual brushed motor controller that accepts both TTL serial and RC inputs. The onboard processor is an ATmega 328 and can be programmed with the Arduino IDE

 

The bill of materials and EAGLE design files are available on the Open Panzer Downloads page.  Source code is available on GitHub:

OpenPanzerProject/Scout-ESC

 

OpenPanzer has shared the board on OSH Park:

Open Panzer Scout ESC