Every couple of projects I ended up rebuilding the same effect: an animated topographic map background, the kind with slowly drifting contour lines. After copy pasting the same WebGL shader for the third time I gave up and turned it into a proper library.

It's called topolines. One React component, zero dependencies, everything drawn on the GPU.

Repo: https://github.com/idleCyrex/topolines

Playground: https://topolines.idlee.xyz/playground

How it works