One Click Test - Tool for quickly testing your design layout in one click.
Fabricator - Build your UI toolkit for website design
W3C Mobile Checker - Make websites work better on mobile devices
Subform - A CAD-inspired design tool for UX/UI design.
ProtoPie - ProtoPie is the easiest tool used to turn your UI/UX design ideas into highly interactive prototypes for mobile, desktop, web, all the way to IoT.
Module 02: Layouts - Professional toolkit for UI/UX design