Qiqqa is by far the strongest solution for research and managing pdf's. Zotero, named as a comparison is weak as it does not allow pdf;s to be loaded into its interface - you need to use a pdf reader, which defeats its whole purpose. With Qiqqa documents in a library can be searched together. It has excellent maps of your libraries. It is not prefect, having a few glitches, but still is the only one of its kind.
Based on our record, Stylus Labs Write seems to be more popular. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
The only app that I've found that has all those features is "write" by styluslabs: https://styluslabs.com/. It isn't open source, but it is available for free. It's cross platform, with ios and android apps too. Seems like it's a passion project by a single developer. I've been extremely happy with all of its features. I use its whiteboard feature for collaboration, and I've found it to be lag free and a much... Source: about 1 year ago
I totally agree with you. One Note is fantastic and I would like to use it but not being able to open the notes in linux makes me avoid it. Do you know if there is a way of opening One Note notes in Linux without using the webapp? (I don't even need to edit them!) In the meantime, I'm using stylyslab write [0] which uses svgz and is a good replacement for OneNote and a compromise I'm willing to make to not be... - Source: Hacker News / almost 2 years ago
I've personally found write by styluslabs to have better pen input than xournal++ (using surface pen on surface go). Source: over 2 years ago
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Xournal++ - Xournal++ is a handwriting notetaking software with PDF annotation support. Written in C++ with GTK3, supporting Linux (e.g. Ubuntu, Debian, Arch, SUSE), macOS and Windows 10. Supports pen input fr...
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
GoodNotes - GoodNotes lets you take notes and annotate PDF documents.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .