Zotero is an open source reference management software to manage bibliographic data and documents. It combines Zotero Standalone for your local desktop in combination with Zotero Connector (saving content from webpages) and can additionally be accessed on the web.
In order to get full texts directly using the "Locate" button, you have to change some settings: go to Preferences, choose Advanced and enter "http://sfx.mpg.de/sfx_local" as the OpenURL link.
Offers a "Capture Function": an icon is shown in the URL bar when a book, article, or other resource is being viewed. By clicking this icon, the full reference information can be saved to the Zotero library
Offers an easy and comfortable way to add notes, tags, links and snapshots to references
Related references can be combined together
Zotero is a webbased system but you can also work locally
ZoteroBib for easily creating a quick bibliography