CSS Scan - Instantly check or copy computed CSS from any element for only ~95$
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Hoverify - All-in-one browser extension to improve your web dev experience.
Invision - Prototyping and collaboration for design teams
Shuffle for Tailwind CSS - Tailwind CSS editor for busy developers
Sketch - Professional digital design for Mac.