BookKeeper is a citation tool for writing papers. It currently formats bibliographies and endnotes in the MLA style and also formats outlines. Additional styles are available as plug-ins. All you supply is the information, and BookKeeper will add in the punctuation and other details. This Java applet/program takes over menial documentation technicalities and lets you concentrate on the most important part of your paper: the content.

What's new with BookKeeper:
APA style plugins are now available.
For those interested in writing plug-ins for customized bibliography entries, a plug-in example is now available.