Smoothstep.io, a Shader Animation Tool
smoothstep.io
smoothstep.io
If you're looking for relatively 'easy' features to add, I'd love to be able to preview in fullscreen. Awesome work!
Settings> Safari > Advanced > Experimental Features > "WebGL 2.0"
https://www.subgraphs.com/#/editor/game_of_life
https://www.subgraphs.com/#/editor/wobbly_image
Note: Each node can be opened to view the source graph/code by right clicking and choosing open.
shadertoy.com is a "newgrounds + github for shaders", with a large collection of user-created content that runs inside the browser. Easy to look and modify source code, too.
Shadron. Really nice desktop tool for creating shaders.
(author - I like your site!)