Refactoring UI started as design tidbits to work smoothly with developer. It stresses on visual hierarchy and systematic approach to UI design from a developer point of view. Brand new ebook and resources are available for $149.
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Combining UI design, prototyping, and feedback in one web-based tool, Figma is more than a design app. Users can iterate prototypes in collaboration, and provide feedbacks simultaneously. It is catching up with Sketch for the need in large-scale design projects. Figma is free to try with limited projects with paid upgrade per user.
Utopia is a calculator that help you to tokenize spacing values to be used with their fluid type calculator.