Requstory - Requstory helps you write your user story quickly.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Pine - A lightweight, modern macOS markdown editor written in Swift
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
mockingbird - Mockingbird helps you you create and share clickable wireframes. Use it to make mockups of your website or application in minutes.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project