I use Mockups a lot and many of my app reviews like this one have screenshots which are made using mockups that good folks share over at Behance and Dribbble.Though it isn't that hard to use Mockups in Photoshop, all you need to do is just replace the screenshot in the smart object, but for some who don't or haven't used Photoshop may find it a bit hard.
Scenery is a new Mac app by A Color Bright that lets you quickly create realistic mockups to showcase your app and designs. The best thing about Scenery is that it makes it really simple to make mockups, all you have to do is just drag-n-drop your screenshot and it will automatically create gorgeous mockups for you.
Although the app is free and comes with a Free Starter Pack which includes 3 free templates, all the other template packs are premium. In order to use your desired template, you will need to buy the template pack first. Using the app is really simple, just drag-n-drop your screenshot on the app and it will update the sample mockups with your screenshots. Now just click on the save icon at the bottom right of your favourite mockup to save the photo. Once it is done generating your photo, you can choose where to save your photo. Scenery app generates photos in high-resolution which is nice.
Currently, the app include shots of some popular devices including iPhone 6, iPhone 6 Plus, MacBook Air, MacBook Pro, Nexus 5 and HTC One M8. The photos generated through Scenery app can be used commercially and have unrestricted license.
Scenery is available free and can be downloaded from the official website.