I have actually had good success with the IRIS software bundled in with an HP Scanner,

But:

a) It is Windows b) It is a good (in the best sense) example of what is still cripple ware c) It is not available to people that don't purchase a scanner, even though PDFs and legal documents often come via email d) It is slow e) It makes every recipient of that document have to OCR it, as opposed to just teaching/demanding the lawyers and courts to distribute them in their original Word/GoogleDoc/WordPerfect/TextPDF form.