Apps similar to eternal include DSP.audio, which is free. Other options are JSPatcher and WebAudioDesigner. In total there are three apps like eternal for the web and self-hosting.
DSP.audio is a web-based editor with live tools to assist with digital signal processing in JavaScript. The editor automatically generates on-screen controls for parameters used in the base class meanwhile providing helpful audio analyzers as well as audio and MIDI input...
JSPatcher is a Visual Programming Language (VPL) in Max/PureData style on the web functioning as a playground for JavaScript Web APIs that lets you easily patch WebAudio native AudioNodes, import and patch external JavaScript modules and customize AudioWorklet DSPs with Faust.
WebAudioDesigner is a visual designer for Web Audio development. It provides a modular interface for building audio patches that can then be exported as JavaScript files.
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