NinjaMock (ninjamock.com)
NinjaMock delivers all of the typical controls used in mobile apps and web designs. iOS, Android, Windows Phone, Surface: all you need to start prototyping apps for your mobile device projects.
Marvel (marvelapp.com)
Turn sketches, wireframes, PSDs and designs into interactive mobile and web prototypes in just a few clicks.
Mobile Wireframe Kit PSD (www.cssauthor.com)
A mobile wireframe kit in PSD format having several UI elements such as login form, profile, settings, list, chat, inbox, feeds, playlist and calendar.