Marker.io for Slack - Turn screenshots into Slack messages ✌️
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Airsketch - Simple screenshots + annotations for Mac 🖥️
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.
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JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .