Infragistics has made the Quince UX patterns explorer available for free to the development community. 

Quince is an online repository of the world’s most useful and usable UX patterns focused on creating superior user experiences where you can go to enhance your own UX designs.

Free and open, anybody can contribute to Quince and grow the UX pattern body of knowledge.  It is all about giving you the UX pattern resource you need to create great UX designs for your end users.