Litmaps - Search scientific literature with interactive citations map
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Deepnote - A collaboration platform for data scientists
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
Amie - GitHub for research and data science
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .