The best sites to get free mockups
General mockup builder
Pixeden hosts stock material including icons, vectors, textures, mockups, text effects, and a lot more. It makes the life of creative designers easier by providing a wide range of categories, presented in a beautifully designed site with more than 24,000,000 downloads. This tool provides both free public domain material and paid membership.
Graphic Burger provides premium quality design resources for free to the community. The selection ranges between mockups, UI kits, icons, text effects, backgrounds, and others. With regular updates, over 17,000,000 downloads, and a special attention to pixel perfect PSD formats, this is a great source of creative material.
Media Loot provides free design resources for creatives under a pretty interface and dynamic filtering. They host a variety of fonts, icons, mockups, graphics, UI kits, and other materials. If you love free stuff, they have a mailing list for the newest updates.
Pixel Buddha hosts free from copyright PSD mockup templates. All creative content is generated by their own team, and contains a wide selection for professional use - including smart objects to make the life of creatives easier.
Perfect Pixels provides free PSD templates for professional creative use in your project. Unparalleled quality feature material mainly focused in the technology sector, with a mailing list to top it off.
Sketch App Sources (Sketch)
Sketch App Sources provides free creative resources for professional use. Mainly featuring technology and app store materials, this site caters to the graphic design community with full support including mailing list and tutorials.
Do - by Invision App, is an amazing UI kit resource. Breathtaking visuals. Vast selection of screens, themes, and components. All free. It brands itself as "the most versatile 'to-do' app you've ever seen," featuring beautiful clean, simple, colorful design.
Tethr - by Invision App, is an amazing IOS UI kit resource. "The most beautiful IOS design kit you've ever seen... also happens to be free." The marketing team for Invision App is on-point, and they keep delivering impressive products.This retina-ready, minimal kit contains over 250 elements, 138 templates, and 8 source files.
UI Space hosts a variety of creative resource material for free. Simple and easy to use. Categories include mockups, fonts, and icons for Photoshop, Sketch, and Illustrator. Choose from the 121 different flat mockups offers, and build your own project with this amazing free tool.
Teehan Lax Tools
Teehan Lax Tools provides diverse creative materials for developers, for free. Elite design, featuring tools for Photoshop and Sketch including elements, templates, and other "things to help you make things." All resources are high resolution, high quality tools including many of the most popular tech devices.