I have recently started using ASTAP, a really great free astronomy software that can do a range of things like plate solving, stacking and contains some really useful tools that can diagnose tilt and can be used to optimise CCD distance when focal reducer/flatteners are used.
I was not aware of this software before so thought that I would alert others to it's existence.
The astrometry solver part of this software has just been integrated as a "plug-in" in EKOS/KStars where it is used in place of the astrometry.net solver. The developer has been providing a lot of advice to KStars users to get them started.
In this setting it is impressively fast, solving in 1-5 seconds (astrometry.net can take minutes to solve).
So for anyone using KStars for automating astrophotography I would really recommend checking it out.
As a stand alone program the stacking and CCD tilt/rotation tools are also worth checking out.
Here is the link to the home page (works on most platforms).
https://www.hnsky.org/astap.htm
Mike