Zotero is a free note-taking and reference making aid. It runs as a stand-alone program or as an addition to Firefox, Chrome or Safari.
Installation instructions for Ubuntu:
Zotero standalone PPA for Ubuntu/ Linux Mint etc.
Ubuntu/ Linux Mint users can install Zotero standalone from the Cogsci.nl PPA
Copy and paste the following lines to a terminal (one line at a time)
sudo add-apt-repository ppa:smathot/cogscinl sudo apt-get update sudo apt-get install zotero-standalone