What are some alternatives?
Adobe Animate CC - Adobe Animate is a multimedia authoring and computer animation program developed by Adobe Systems.
Invision - Prototyping and collaboration for design teams
SWiSH Max - SWiSH Max is a Flash creation tool that is commonly used to create interactive and cross-platform...
Proto.io - Create fully-interactive high-fidelity prototypes in minutes that look and work exactly like your app should. Sign up for a free 15-day trial and get started.
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Flinto - The prototyping tool designers have been waiting for.