[freddex]

It's mostly a tool to manage research literature. It allows you to add works you are viewing in your web browser to collections. Then, you can create bibliographies from these collections. As a researcher I use it a lot, since it makes working with references much smoother. There's also extra features like cloud syncing and most recently an integrated PDF viewer and annotator. https://www.zotero.org/

[P-Nuts]

A bit like JabRef then? That was what I was using when was in academia but that was 15-20 years ago.

[DoctorDabadedoo]

Exactly like the new generation of JabRef and Mendeley.

[swamp_donkey]

Qiqqa used to be my choice in this space but the devs have moved on