Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Saint Paint Studio - Saint Paint - The Essential Image Editor
Invision - Prototyping and collaboration for design teams
Stet.io - Stet.io is a high-quality pixel management platform that allows editing the pictures with online commands or multiple options with real-time effects or filters.
Sketch - Professional digital design for Mac.
ImageForge - - ImageForge Standard Freeware Edition: