Here is where I will post some information on news from the Open Source Robotics Foundation, ROS, robot lawnmowing world.
TurtleBot3 should be out in August. One version is about $550 and another is $1,800. http://turtlebot3.robotis.com/en/latest/
7/15/17
Found a website that says it makes learning ROS easy: http://www.theconstructsim.com/robotigniteacademy_learnros/
4/22/17
LUNAR LOGGERHEAD coming this May! Check it out here: http://www.ros.org/news/2017/03/lunar-loggerhead-buildfarm-available.html
New book for ROS--ROS Robotics Projects: http://rosrobots.com/ ..... and I got my copy!
3/17/17