Zotero

The RTF scan function allows you to create a bibliography from a rich-text document without the use of the Word or Open Office plug-in. RTF scan works best when you're working with a small number of references you are familiar with. 

As you write your document, include author citations encased in curly brackets as follows:

{Smith, 2009}
Smith {2009}
{Smith et al., 2009}
{John Smith, 2009}
{Smith, 2009, 10-14}
{Smith, "Title", 2009}
{Jones, 2005; Smith, 2009}

When you're done, upload your .rtf file to the RTF scanner, and Zotero will produce a bibliography.