Purple UI Kit

Source: http://dribbble.com/shots/1280534-Purple-UI-Kit-PSD

SmoothBerry

Source: http://www.behance.net/gallery/SmoothBerry-Free-UI-Kit/9762995

Flatty UI

Source: http://www.behance.net/gallery/Flatty-UI-Kit-Free-PSD/10930913

Blog/Magazine Flat UI

Source: http://graphicburger.com/blogmagazine-flat-ui-kit/

Login Form UI

Source: http://dribbble.com/shots/1269922-Login-Form

Blue UI Kit

Source: http://www.behance.net/gallery/Ui-kit-free-psd-Project/11601453

Free Flat UI Kit

Source: http://www.behance.net/gallery/Free-Flat-UI-Kit/10070543

Responsive UI Kit

Source: http://www.uipixels.com/responsive-ui-kitpsd/

Flat UI Kit

Source: http://www.behance.net/gallery/Free-Flat-UI-Kit/9819319

Colour UI

Source: http://www.behance.net/gallery/Free-Color-UI-Kit/9924127

Behance Style Flat UI Kit

Source: http://www.uipixels.com/behance-style-flat-ui-kitpsd/

Grayscale UI

Source: http://dribbble.com/shots/1279970-Grayscale-Ui-Kit-Free-PSD

Bleya UI

Source: http://www.behance.net/gallery/Flat-UI-Freebie/11324647

Flat UI Kit

Source: http://dribbble.com/shots/968433-Freebie-PSD-Flat-UI-Kit-2-Blog

Flat Rounded Square UI

Source: http://www.webappers.com/flat-ui-kit/

Do you know of any other flat UI kits that you think should be included in our roundup? Have you used any others in your own apps? Let us know in the comments!

David works for Radley, who specialise in beautiful handbags. When he’s not working, he enjoys studying user interface and product design.