Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Citationsy BookScanner - Scan the barcodes on the backs of books to cite them
Citavi - Citavi is a program for Microsoft Windows that manages literary references and organizes organizational knowledge.
Citationsy - Citationsy is a reference tool to create citations, reference lists, and bibliographies.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
Formatically EDU - A simple, beautiful, and fast citation manager for teachers