What do folks know as far as alternatives for document comparison programs. I found something online but after a few freebies they want monthly or annual subscription. I'm comparing the transcription of a manuscript version to the published version of a text and want to see matches and similarities to be able to note or quantify the extent of the changes (e.g., almost unchanged to drastically revised with few similarities). I've basically been reading in parallel but need to move faster than that. So far I'm not getting as good results as the manual check. MS Word document compare is little good for this.