Tools

State of animations in Inkscape https://inkscape.org/learn/animation/

JavaScript libraries

SVG.js https://svgjs.com/

Raphaël http://dmitrybaranovskiy.github.io/raphael/

D3 https://github.com/d3/d3/wiki/Gallery

Layer Cake for Svelte https://layercake.graphics/

Sozi https://sozi.baierouge.fr/

Tutorials

MDN about CSS animations https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Animations/Using_CSS_animations

SnapSVG and Inkscape http://goinkscape.com/category/inkscape-tutorials/inkscape-snap-svg/

2013 look at SVG animations http://tavmjong.free.fr/SVG/ANIMATION/

Animations best practices https://uxdesign.cc/the-ultimate-guide-to-proper-use-of-animation-in-ux-10bd98614fa9