Zotero
Also on WindowsCollects, organises and cites research sources.
Installs from Flathub.
Good news: Zotero runs on Linux. It's the same app you use on Windows, and TuxPick installs it for you from Flathub.
Install Zotero with TuxPickIt works on Ubuntu 22.04 and 24.04, and on systems built on them like Zorin OS and Pop!_OS.