What are some alternatives?
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
FreeMind - FreeMind is a premier free mind-mapping software written in Java.
EndNote - EndNote is the industry standard when it comes to reference management in a comprehensive format.
XMind - XMind is a brainstorming and mind mapping application.