Thank you for pointing TSX out but I found nothing astro-related on LTI. I’d be interested to know what TSX does or has that is EAA-ish. Everything on it that I scanned through after seeing your post seemed to be deeply into full AP and it’s a fairly pricey application as well. Is there perhaps a basic version of the program that has the same functionality of Sharpcap Pro - mainly the live stacking, and ‘on the fly’ application of Dark and Flat frames?
Yes, TheSkyX Pro does live stacking, with auto-alignment of frames, bad frame rejection, application of flats and darks, debayering of color frames, automatic stretching with live slider adjustments, etc.
Beautiful full-color images appear with progressively less noise and more detail over a period of seconds and minutes as you watch, just like in SharpCap Pro. You adjust the image live with sliders for the stretch and color balance. You can zoom in and out of the stacked image to trade off magnification and framing for resolution. And you can save the live stack as a jpg or fit file, or even the individual frames as a video or series of fits files for later post processing.
TSX handles pointing, nudging, guiding, polar alignment, mount modeling, and has different tracking rates for the moon, plants, sun, and stars (even satellites and comets). Not incidentally comes with a massive celestial database and is based on a virtual planetarium.
As you write, TheSkyX is a mature suite of long-exposure astro-imaging features. And also, sure enough, it's very expensive. There are cheaper "stripped down" versions (First Light, Student, Serious Astronomer, etc) but I don't have them so don't know exactly what the read-offs are between prices and features for each one. You could call or email them for details.
The Live Stack functionality is in the "Camera" module. There are four tabs there: "Take Photo" "Auto Guide" "Focus Tools" and "Take Series."
Live Stack is a button on the "Take Photo" tab. When you click it the entire screen is taken over by a much simpler interface that features the emerging live stack front and center, with only those controls you need to enhance the EAA experience.
Unlike SharpCap Pro, TheSkyX Pro runs on Windows, Linux, Max, and Raspberry Pi. I usually run it off a generic linux box at the mount and use TeamViewer to connect from a laptop, iPad, or even my phone.
Last month I did an outreach event for over 100 people doing live EAA with my MacBook Pro attached to a projector and screen. Showed them full-color nebulae, clusters, and even distant galaxies (m51, m101, m74) in beautiful color in under a minute. Lots of oohing and ahhing!
I like SharpCap Pro. I bought the Pro license, and still use it sometimes. But I find its interface cluttered and confusing. And since I have a Paramount I have to use TheSkyX to control my mount anyway, so I generally just prefer to stick with it for EAA as well.
Hope this helps!