Great to have it on Linux, I will have to try it on my Rpi running Ubuntu. I have been using AI's collimation tool, running on my laptop. I control the RPi, running Kstars at the scope, over ethernet cable to a laptop inside my garage (where it is warm) over VPN. As long as I am doing collimation using an artificial star the scope is still in the garage (on wheels, so I can roll it out on the driveway for seeing the night sky), then having the tool on the laptop is ok. But if I try to collimate using a star I need to be at the scope, where I have a tablet, also running VPN, so I can see the screen for polar alignment and focusing. When I get this running on Ubuntu, next time I uncover the scope, I can use it for star collimation.

One suggestion, in AI's collimation tool there is a break in the crosshairs at the center, so you can really see the out of focus star central spot and how well centered it is in the cross hairs (the crosshairs are also not as thick as yours) and which way to make the final small adjustment. You might think of making that change. It is only a suggestion and I have not tried your tool as it is, so it may work just fine. I would be interested in hearing other users comments.
thanks,

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