wireframe layout toolkit free illustrator ux web mobile design Kits to create wireframes with.
Responsive Website Wireframe Kit by UX Kits on Creative Market: - Love a good success story? Learn how I went from zero to 1 million in sales in 5 months with an e-commerce store.
two tone: Dark, light and white
Another example of high fidelity wireframes.
The Carbon WireFrame for Adobe Muse. These layouts are easy to update and finalize, simplifying responsive design in Muse. - from MuseThemes
One of the versions of Contentful markdown editor prototype.