Anima App - Design, get feedback, convert to code, publish, iterate.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Timeline for Sketch - Create beautiful timeline animations in Sketch
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Invision - Prototyping and collaboration for design teams
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project