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SubframeSelector in PixInsight offers the abiity to analyse and grade subs like CCDI. There are also scripts for mapping FWHM and Eccentricity over the FOV and for flat frame analysis. PI will also do plate solving and give you an accurate focal length (which CCDI doesn't do.) However, PI doesn't have any equivalent to the collimation stuff in CCDI.
If you're using PI for processing already then you probably don't need CCDI. I own a copy of CCDI and never use it now. If you don't use PI then it's probably not worth it just for this purpose... but I don't know of anything else that offers similar capabilities.
Cheers,
Rick.
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