I looked around, and ended up choosing Referencer:
It is also very easy to use, and the GUI is not only clear to read but also has a window for note taking, which is eminently practical. I like how I can input author and date from a downloaded document (usually a PDF), and then just click "Google Scholar" in the context menu, click on "cite" on the Scholar reference > BibTeX, copy the contents of the page that comes up, and then click a button to paste in the information into Referencer.Referencer is a GNOME application to organise documents or references, and ultimately generate a BibTeX bibliography file. Referencer includes a number of features to make this process easier:
* Automatic metadata retrieval from PubMed, CrossRef and ArXiv
* Smart web links
* Import from BibTeX, Reference Manager and EndNote
If you are looking at reference managers, this is a good one to consider.