Moco is a closed-loop brushless-motor controller. It is meant to glom onto the back of a 2805 gimbal motor and provide precise torque, speed, and position control.
Versioning is in vArB format. Incrementing B indicates a new revision has been produced that does not change external interfaces (form factor, communications, etc...). Incrementing A indicates a new version that changes these external interfaces. Until version 1 no there are no stability guarauntees.