I would be very interested to ask for a list of repos of free open code, applicable to 8-bit avr-s and having relation to robotics - object avoidance, process controllers, battery management. This would be of huge help for me, preventing me from wasting weeks and months to invent the wheel.
I see two problems with this. First, the question is broad. Second, this is a list question.
How, if possible, can I shape my question in a form, that is appropriate for Robotics.SE?