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Svelte - Cybernetically enhanced web apps
One Click Test - Tool for quickly testing your design layout in one click.
DronaHQ Designer - UI design tool to build captivating front end with no code.
XPRS - Free website builder - making web design like Lego™. No code
FlexboxPatterns - Build awesome user interfaces with CSS flexbox
Dimensions Toolkit - Chrome Extension for designers to test responsive websites.