[atombender]

Another great app is DEVONthink [1]. It's not as good (if at all) at scientific citation management, but it's a brilliant app for saving a database of information.

Devon supports PDFs, Markdown, images, bookmarks (which can be viewed in the app), and more. The PDF handling is superb. The search is excellent, and it has extensive support for tags and metadata. Sync is very good. I also like that it stores each collection as a separate database file that you can keep in different places.

Among other things, I use it to collect and categorize images, which works really well because you can view any collection/folder as a "gallery".

My only complaint is that the databases are local, and you only sync between devices. I can't share notes with other people for real-time collaboration.

[1] https://devontechnologies.com/apps/devonthink

[walterbell]

Their iOS app is a lifesaver, because it will sync robustly across iOS/Mac devices, via WebDAV on FreeNAS, and includes a built-in web scraper for public pages, PDF and even audio files. With censorship increasing, it's valuable to have a local cache alongside the tagged bookmark.

[SomeHacker44]

Agree on DevonThink. Unfortunately I have recently left the Apple ecosystem and have not found a good replacement for this for Windows 10. Almost everything else has been replaced or was cross platform.

(The other thing is Foreflight, which may keep me as an iPad owner solely for that. Sigh.)

[newfromblammo]

You can share a whole database for collaboration, I have been doing this for years.

[atombender]

You can of course share for syncing, but real-time collaboration like Google Docs, or Apple's Notes?

I believe Devon has zero support for conflict resolution. It can only overwrite or duplicate on conflict.