Any good recommendations for PDF editors/tools to comment on PDFs. Essentially whats the OSS alternative to Adobe acrobat? I’m a TA and need to give students feedback on reports and haven’t found something that easy to use so just wanted to see what the community recommends.
- Not long after this post, BentoPDF made an appearance 
- If the reports are somewhat technical (written with Latex for example), check out sioyek: https://sioyek.info/. It’s a PDF reader mainly for academic use. - Sioyek has made reading and reviewing papers SO much easier and it’s really, really convenient… once you get the hang of it. It takes a bit of time to get used to all the things, but it’s worth it. I also review students’ theses with it. Highlighting colors and adding comments is super easy (select text, h+g (green highlight), type comment). - If you have want to export your notes and comments, you will need this script though: https://github.com/ahrm/sioyek/blob/main/scripts/embedded_annotations.py 
- If you need advanced modifications, Inkscape is surprisingly capable! 
- Zotero. Syncs even between different devices. Bibliography and annotation. Great. 
- Try evince. 
- Master PDF Editor is one of two proprietary apps I currently have running on my laptop, and I would definitely say it’s worth the price (although once in a while when they update they manage to mess something up, but will usually get around to fixing it eventually). - This was quite a long time ago, but I had a lot of issues with Okular, though I don’t remember what exactly (one thing was that if you changed a document’s location, Okular would lose all the bookmarks you added to it, but they may have changed it since then, IDK). Evince’s commenting features seem a bit rudimentary to me, but I’ve only used the one from the Mint repo, so there may be a newer version that’s better. - There’s also PDF4QT which is open source, but is kind of new and may be a bit rough around the edges, although it does look promising. 
- Papers or Zathura (+ required plugin) 




