I use Rhino - as you know, Matrix is built on top of it. Used to use RG, but it’s too buggy to rely on and I don’t feel like paying again for the newer versions (and all-new bugs).
I’ve got a cheap (and probably quite dangerous) near-UV laser pointer from EBay - never trust the things as eye safe and handle accordingly. 405nm, 1mW IIRC.
I also have a Laserstar welder - it’s proven to be quite useful for a number of things.