Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.

EndNote - Accelerate Your Research. Save time, stay organized, collaborate with colleagues and get published with EndNote 20.

Academia.edu - Academia is a website where you can share papers that are written with other users. You can use a Google or Facebook account to sign in to the website.

JabRef - Graphical Java application for managing bibtex (. bib) databases.‎JabRef · ‎JabRef Help · ‎JabRef | Blog · ‎OpenOffice/LibreOffice .

Google Scholar - Google Scholar is a freely accessible web search engine that indexes the full text of scholarly...