Mockup Generator 

Gone are the days of being handy with photoshop to superimpose your designs. This comprehensive list of free automatic mockup template generators is the perfect way to show off your design work! Rather than presenting a design as a boring flat design file, you’re able to show it in a real world setting! Best of all, the entire process takes literally a single step and is achievable in a matter of seconds. These templates are easy to use, incredibly professional and hugely varied – bringing you everything from business cards, brochures, photos, real-life settings, tech devices, posters and much more!
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Mockuuups provides a drag-and-drop tool for creating beautiful app previews and marketing materials. Place your design instantly to the huge collection of mockups and find your ideal in a second. Easily create stunning visuals which helps you boost engagement on social, blogposts or advertising campaigns.

Mockuuups isn't browser based like the majority of other automatic mockup generators - you need to download their app (available for Mac or Windows 7). It only takes a few seconds then you can get stuck in straight away. The environments and images are stunning and look very realistic. Only slight issue is the ability to adjust your screenshot after the upload, as it can sometimes be slightly off due to the dimensions. 
Mockupsjar offers some alternative mockups that others don't, including flat design browser mockups which are great to show off examples of your website on social media. MockupsJar also includes some great picture frame mockups, t-shirt, packaging, vinyl, books, billboards and almost every current device imaginable including the new iPhone X (10) and Apple Watch. Mockupsjar is extremely easy to use and it's totally free to download in a variety of resolutions. 
A great selection of various mockup environments for iPhone, Apple Watch, Macs, Android, Samsung and many more. Very simple upload process and available to download in a variety of resolutions. Free for commercial and non commercial use. No copyright, no attribution needed. 
Dunnnk is another good tool to generate website mockup in iPhone, Android, MacBook, iPad and iMac devices with high definition output. Dunnnk is very easy to use, just click on the real life device mockup you want and upload your website screenshot, then you will get your website mockup within seconds. You can download your generated image as jpg format or share on Twitter.
MockUPhone by Oursky is a free tool that helps you wrap app screenshots in different mobile devices, desktop computers Tv's and more. MockUPhone is extremely easy to use. Just take a screenshot from your chosen device, uploaded it and let MockUPhone work it's magic. Within a few seconds you can download the zip file containing various PNG files with the chosen device at different angles. MockUPhone is free and requires only an email address when you are ready to download the files. 
Mockuper is a free online mockup generator that lets you design your products mockups easily and quickly. Choose between desktop mockups, phone mockups, tablet and even posters or business cards mockups. Generating your product mockup could not be easier. Just choose a device type and upload your screenshot, adjust reflection settings and other useful parameters. In less than 2 minutes your mockup will be ready to download. 
ShotBot is a screenshot builder for iOS & Android apps. It can create iPad, iPhone screenshots & Android screenshots that Apple and Google require for their app stores. No design skills required. Choose from beautiful ready-made templates. Give them a caption, select a background colour. ShotBot is free and downloads your screenshots as a zip file in jpg format. 
Provide your website URL and you will see it mocked up on a large selection of device images. Mockerie places an iframe on these images, so you can embed it and interact with your site. Mockerie also provides filters for your images if you are looking for that instagram look. Not a huge amount of free mockups offered but certainly worth a visit. 
With Dimmy.club you can create mockups for you website in seconds. Choose from the desktop, laptop and mobile latest devices and their associated colours. This is one of the most modern automatic mockup generators in the list and includes the new Space Grey iMac. You can also change the background colour or remove it entirely. It's totally free and no signup required! 
If you have a cool app and want to show it to your customers, simply upload a screenshot and download high quality images of your app. However, don't be fooled by the name they also have a great selection of laptop and desktop mockups. Again super simple to use, just upload your screenshot and presto. 

They also have the latest mobile devices, from iPhone to iPad to the Apple Watch to the latest Android devices.
Smartmockups is an online tool for all designers, marketers and developers out there. With their curated collection of the free product mockups you can present your design like a boss! All mockups are ready for both your personal and commercial projects. Create your mockups by either uploading your screenshots or entering your website URL. Some images an environments are slightly fake looking, however there are some high quality unique looking environments to add your app or website to. 
Placeit provides literally thousands of Free iPhone, iPad, iMac and Macbook Mockups in a variety of environments to suit any project. Placeit also provides video mockups to showcase your website or app in a variety of environments. Placeit also integrates with Recordit allowing you to record your screen using the free Google chrome extension. 
TechSini has to be one of the simplest, easiest automatic mockup generators I've used. Simply paste your url and Techsini automatically generates a mockup showcase including iMac, MacBook, iPhone and iPad. They have now just realised a 2.0 update which brings the ability to remove devices, adjust position (drag and drop) and change the background colour. 
Browser Frame provides browser frame mockups in a modern flat design. They provide both windows and mac browsers for Chrome, Explorer, FireFox, Mozilla, Safari and Edge. You can either input the url of website and Browser Frame will position the screen automatically or upload a screenshot. Browser Frame downloads in png format with the click of a button. No signup required, it couldn't be easier. 
AppInstitute let's you create app screenshots in a matter of minutes. Choose from a selection of pre-made templates, customise colours, layouts and background. AppInstitute is compatible for both Apple AppStore and Google Play stores and allows you to export your designs for all device types. AppInstitute is 100% free and requires zero design skills.  
AppLaunchPad provides thousands of pre-made mockup templates to select from for free. Fancy creating your own bespoke designs? AppLaunchPad provides a great drag and drop builder, making it super easy to edit text, fonts, colours and backgrounds. Select from all modern device types, including tablets, desktops and smartphones. You can even upload your own custom graphics or select form their library.  
Screenpeek is a super simple mockup generator. Simply copy and paste a URL link and a simple mockup is generated in png format with a transparent background. Screenpeek are particularly proud of the fact that it only takes 10 seconds until the result is ready for download in high resolution. Currently they provide the latest iPhone, iPad, iMac and MacBook. Only the iPhone is free to download. 
Screely instantly turns your screenshot into an image you can share anywhere. Screely adds a nice dropshadow, mockup browser window to a background colour of your choice. No Photoshop or Sketch templates necessary!