It has been a long time since we last took a look at what GUI kits were freely available. So, in this round-up we thought we would bring you right up to date by taking a look at some of the best and freshest that are freely available.
Every designer who has spent many hours mocking up web pages or mobile apps will tell you how important it is to have a reliable set of re-usable, editable and uniform GUI elements that they can rely upon for the initial rapid prototyping stage of any project. Within this post you will not only find complete web and mobile GUI kits as we have also included some comprehensive wireframe kits and application design kits as well. All of the kits are are fully editable and are primarily available in .psd format (there are also some in .png, .ai and Omnigraffle formats). Enjoy :)