I've seen a video where the Accordance software is being used, and seen how easy it is to use the Nestle-Aland critical apparatus. Is the electronic version of the critical apparatus available for free anywhere?
I think just the text itself can be read and viewed freely, as the aspect that you re looking would be under copyrighted domain and thus be charged for use.
I found that Accordance has a module with the NA28 text and apparatus for $109. E-sword has a module with the NA27 text but no apparatus for free.
Maybe I should open up the scope of my search. Are there other resources of textual variant information?
The reason I am looking is that in my search to understand Scripture I sometimes compare English translations (as one of my study methods) and occasionally run across a Greek textual variant.
I post an example of what it can give from a passage. The hover feature over the Mss is very helpful too. You may never need NA's apparatus again. It has a wide range of options for searches (by text-type as below, dates, etc.)