Mockups Design - Mockups Design is the most leading web-based application that comes with a vast collection of creatively design mockups for all kinds of products and devices.
Placeit - Generate realistic product shots in seconds
Mr. Mockup - Mr.
Screenshot.rocks - Create beautiful browser mockups from your screenshots
Pixeden - Pixeden is an all-in-one premium design and web resources platform that provides high-quality graphic design templates and lots of other files.
Pika App - A free tool to quickly generate beautiful browser screenshots. You can capture screenshot from website, add browser frames, 3d tilt-effect, background colors to screenshots and more