Bibfilex

Bibfilex is a free bibliographic manager for GNU/Linux, Windows and OS X.
Bibtex Editor

Easy to use online Bibtex Editor. Lets you manage Bibtex directly in your browser.
BibTeXSearch

A scientific record discovery tool.
ReferenceRepository.com

A repository of article references and research paper topics for students and research scholars.
LibreOffice Plugin for Zotero

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

A new FREE citation generator.
F1000Workspace

Discover, annotate, write and share scientific research.
wizdom.ai

Comprehensive research intelligence platform.
Utopia Documents

Utopia Documents, a next-generation scientific article reader.
PubMed.gov

PubMed comprises more than 29 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.