I used to find http://www.patterntap.com quite useful to get inspiration to design forms, tabs, and other web elements etc.
Unfortunately after the ZURB acquisition of Patterntap now they enforce you to sign in with your Twitter account in order to simply view larger images of patterns provided by the crowd. So in some way it's not free anymore.
Do you know of alternatives to patterntap that are free and you are not obliged to sign in?