Handsome Illustrations - Create unique illustrations for websites & applications.
Screenshot Bin - Generate website screenshots and thumbnails at scale, right from your app. Screenshots as a service.
Isometrica - 3D illustration constructor with 380+ isometric objects
Struct Illustrations - Create your own unique story with editable illustrations
Craftwork - A collection of User Interface resources made by Craftwork
BAM Free 3D Illustration Kit - More than 30 high quality 3D icons, free to use.