Does anyone use Roborealm for machine vision? I just want to know if it's worth buying it or if there is a free software of the same sort?
I haven't used RoboRealm... I've just started using OpenCV successfully with C++ programming and look forward to using it with Python (I inspired a Python finatic to start experimenting with OpenCV) as it is easier to deal with the many structures. A little bit of a learning curve but it is an awesome open source computer vision library developed by Intel.
If you are using Arduino you should check out MyRobotLab (open source), although you can use it without Arduino.