RefWorks is a web-based personal bibliographic software manager which is accessible anywhere in the world. It can help you collect and manage citations of books, journal articles, websites, etc. It can also assist you in creating bibliographies in over 200 citation styles, such as MLA, APA, Chicago, etc. A separate add-on module, Write-N-Cite, allows you to create a document in MS Word and dynamically enter citations from your RefWorks database, with your document and bibliography automatically generated in the chosen citation style.
WorldCat Lists is a free citation tool to cite research items and help you create a bibliography.
Zotero [zoh-TAIR-oh] is a free, easy-to-use tool to help you collect, organize, cite, and share your research sources.