Animista - Create beautiful CSS animations in your browser
Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
CSS Animation Cheat Sheet - Awesome CSS3 plugin for spiffy animations
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Keyframes.app - A timeline editor for CSS animations
Figma Design Tokens - Making design tokens a single source of truth for Figma.