Automated Workpapers

I'm looking for recommendations for automated workpaper software.  Specifically, being able to organize workpapers (Word and Excel) and add tickmarks, notations etc. to supporting pdf documents.  (Normally I would have printed in hardcopy and used my red pencil.)  However, now with our remote environment, I would really like to automate as I am prevented from being able to print any documents at home.  I am a one person shop so do not need something with a ton of bells and whistles (or anything super expensive).  What software program do you use or recommend?