Pololu Zumo 32U4 Robot Kit (No Motors)
Motoron M2H24v16 Dual High-Power Motor Controller - 2-channel DC motor driver for Raspberry Pi (no connectors) - Kamami on-line store
Pololu A-Star 32U4 Robot Controller LV 11V - Botland - Robotic Shop
This programmable module is designed to be the core of a small robot, either as an auxiliary controller atop a Raspberry Pi base or as a complete
A-Star 32U4 Robot Controller SV with Raspberry Pi Bridge (SMT Components Only)
Motoron M3H256 Triple Motor Controller - 3-channel DC motor driver for Raspberry Pi (without connectors) - Kamami on-line store
3pi+ 32U4 Robot Kit with 30:1 MP Motors (Standard Edition Kit)
Pololu - 3.9. Pinout
Pololu - Building a Raspberry Pi robot with the A-Star 32U4 Robot Controller
Balboa 32U4 Balancing Robot Kit (No Motors or Wheels)
Pololu - 3pi+ 32U4 Robot - Standard Edition (30:1 MP Motors), Assembled