Another example of high fidelity wireframes.
UI wireframes and flowcharts kit.
Really great Flat UI kit we at C&C found: Free Awesome Flat UI Kit A kit showing a flat UI design.
UI Kits for Landing Pages by Gris Fox on @creativemarket
UI Tiles: Wireframes and Flowcharts Kit - GraphicsFuel
It is really interesting looking at UI kits, seeing how the same content can be laid out multiple times. Ghost Ship Mobile UI Kit Published by Maan Ali
Clean, simple, fun yet sophisticated colors - Flat UI - Free Interface Kit ** note to self: saved both PSD and HTML versions on dropbox > UI kit