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All the Astro apps autoalign mono subs as far as I know, even astroart?.
Aligning in PS is time consuming in comparison. Astroaps automatically look for stars to align on and move, rotate, scale and even sometimes warp to align subs all in one go, then if you wish, combine them into a colour image with auto/manual adjustments for colour balance such as white and background black sample selections and RGB weights.
A common practice is to have the astro app align the 4 LRGB sub stacks to each other, then export to PS for colour combining, which is easy since the are already aligned.
Apart from the freebies I havent used (im pretty sure they do too), CCDsoft,CCDstack, Registar, DL.
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