ANNIN ROBOTICS

https://github.com/ongdexter/ar3_core

ROS - info 

https://www.babacad.com/robotics/

https://www.tpm-pac.com/product/rpx-l132-ar36a/

https://robodk.com/robot/Annin-Robotics/AR3

I have been told the drivers for the AR4 have been delayed but are still planned.
https://robodk.com/contact