[duncanawoods]

For "ebooks, papers, articles" I use calibre as the database - it manages all the relevant meta-data and converts between formats. I then sync the calibre folder in google drive for search and cross device access.

https://calibre-ebook.com/

For notes, I found the majority of my note-taking is research and reasoning to support decision making for either software or business projects. For that I built my own tool to capture rationale make it useful:

https://thorny.io