Pybliographer - Pybliographer is a tool that helps you manage your bibliographic databases in a user-friendly way.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Aigaion Reference Management System - Aigaion is a bibliography management system that seems to be the perfect tool for managing your bibliography and references.
EndNote - Accelerate Your Research. Save time, stay organized, collaborate with colleagues and get published with EndNote 20.
ProCite - ProCite is a tool for creating citations according to the standard defined by the users.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.