Butterchurn
Butterchurn is a WebGL implementation of the Milkdrop Visualizer
...The engine uses GPU acceleration through WebGL to achieve high performance, allowing it to handle intricate shader-based visualizations without overwhelming system resources. Butterchurn supports preset-based rendering, enabling users to load, customize, and switch between a wide variety of visual styles that evolve over time with the audio signal. It can integrate with web audio sources, making it suitable for use in browser-based music players, streaming platforms, or standalone visualization tools. The project emphasizes both artistic expression and technical performance, offering a balance between visual complexity and efficiency.