Relate UI kit is a free package for quick prototyping built for Sketch and Photoshop including 45 templates, 15 categories and more than 99 elements.
Kauf is a free web UI kit built with Photoshop by Yebo that you may find useful you to bring your ideas to life in no time with super quality design.
Kauf: Free web UI kit for Photoshop
Landing is an UI kit for Sketch and Photoshop including tons of handcrafted components that may help you to increase your web creating speed.
Landing: Free UI kit for Sketch and Photoshop
Deadline is a free UI kit for Photoshop including hundreds of elements and 82 awesome screens in 6 categories designed and released by Rajesh Rajput.
Deadline: Free UI kit for Photoshop
Carbon Wireframe Kit is a good starting point to design a professional ecommerce app in Google Material style.
Carbon: Material UI kit for ecommerce apps
This week featured freebie is Monet, a free mobile UI kit by Konul Bayramova. The kit includes 16 high-quality iOS screens in PSD format.
Monet: Free PSD Mobile UI kit
Exclusive
Here is a free UI kit made of 55+ elements for designing clean and modern websites. Free PSD created and released by AgenceMe.
55+ Elements UI kit for building websites
Slides 2 is a huge pack of design resources created for Slides Framework. Free PSD and Sketch files released by the design team at DesignModo.
Slides 2: A free huge pack of design resources
Avital is a free UI kit containing tons of useful elements and components to create mobile apps. It also includes 21 ready-made screens for iOS.
Avital: Free UI kit for mobile apps
Free exclusive pack from Epic UI, a kit containing over 100 elements divided into 9 categories. Designed by the guys at EpicPxls.
Epic UI: free exclusive sample pack
Exclusive
Portland is a UI kit based on Bootstrap grids for creating modern website templates. Free PSD designed and released by Denis Shepovalov.