Reference manager

I used Endnote, however, after a while I stumbled upon Zotero that I´m using now. I like its library sharing function, its flexibility, its open-sourceness and how well the import function works. Furthermore, I like the one-click idea for reference import.
Today, I was a amazed by the fact that one can just drag&drop the "download"-PDF button onto the reference to include the fulltext with the reference.
The library sharing function works well to sync references in my group, at home and within my research group.