Do Bot
Niyro One  (open source)
Arduino Raspberry ROS
MECADEMIC
CTRL
Find & Recognize
Maximo

ROS tutorial #1: Introduction, Installing ROS, and running the Turtlebot simulator.  cumbersome

An Introduction to ROS, the Robot Operating System: Intro to ROS (2/6)

What is ROS (Robot Operating System)| Introduction to the Tutorials

Turtlebot  $2000
14.04 Ubntu
Python
Command Line
(1) ROS tutorial #1: Introduction, Installing ROS, and running the Turtlebot simulator. - YouTube