Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Clever - syncing between education applications for K-12 schools
Citavi - Citavi is a program for Microsoft Windows that manages literary references and organizes organizational knowledge.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
Claroline - Claroline is a collaborative eLearning and eWorking platform.