UXPin is the UX Design Platform that gets it right.
We are also designers and we wanted to help design teams in daily work. So we started with notepads and now we're providing complete tool for creating products and services in cooperation with other members of design team and clients.
With UXPin you could prepare wireframes, create prototypes and add comment on pixel perfect projects. And everyday we try to add something that makes your work easier/better/more functional.