e-Comm is a free UI kit that contains 22 well organized and layered app screen designs, covering all the main user flows. All main UI elements are separated on to one ‘Components’ artboard, so any element could be directly grabbed from there and be added to your design project. Even though this UI kit was mainly created for online stores, the components by themselves could be used on a variety of apps. There are many UI components such as lists, tags, message bubbles, comments, different button states, to name a few.
Be sure to check it out and download the UI kit