Naturally, HARMONY can do abc as well (with multiple parts), but of course, it is Windows-only.
HARMONY also allows drag and drop editing (as well as text editing). I think this is easier for the aligned text, which was originally requested, because you can just add the text to the appropriate notes. With abc, you have to get the whole line right in one go.
By clicking on the User Name, you will requery the forum for that user. You will see everything that he or she has posted with that Mudcat name.
By clicking on the Thread Name, you will be sent to the Forum on that thread as if you selected it from the main Mudcat Forum page.
By clicking on the Subject, you will also go to the thread as if you selected it from the original Forum page, but also go directly to that particular message.
By clicking on the Date (Posted), you will dig out every message posted that day.