Create 100% free digital product mockups: SmartMockups

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Smartmockups is a 100% free web app that allows to create digital product mockups that integrate any photo, logo or screenshot of your product / app / website inside professionally-shot free-licensed pictures of computer screens, smartphones and tablets.

The final result can look quite impressive and it can be used for promotions, ads, and for other marketing related applications. 

100% free. (ad-based)

My comment: It does what it promises without asking anything in return. Easy-to-use, immediate, good choice of images. Excellent quality at zero cost. Recommended.

Try it out now: http://smartmockups.com/

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*More tools to create digital product mockups: https://web-design-tools.zeef.com/robin.good#block_48662_digital-product-mockups