Adobe XD
Figma
UXpin
Sketch
ProtoPie
Invision
Mockplus
Balsamiq
Creature
Spine
Synfig Studio
Unity 2D
Spriter Pro by BrashMonkey
Blender
CrazyTalk Animator
Animation Paper
Adobe XD
CreatureFigma - Team-based interface design, Figma lets you collaborate on designs in real time.
Spine - Spine is 2D animation software designed specifically for software and game development.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Synfig Studio - Just another WordPress site
Sketch - Professional digital design for Mac.
Unity 2D - Unity 2D is a powerful and feature-rich game design solution built from the ground up to fulfill every basic and advanced need of the developer.