The WebAssembly component model is aimed at having composable components that can call each other. The components can be written in any language, compiled to WebAssembly, and interoperate: https://github.com/WebAssembly/component-model/

Extism is a plugin framework for WebAssembly:

https://extism.org/

https://github.com/extism/extism

Postgres and Extism: https://dylibso.com/blog/pg-extism/

Wasm plugins for Zellij: https://zellij.dev/documentation/plugins

Visual Studio Code can run WebAssembly extensions: https://code.visualstudio.com/blogs/2024/05/08/wasm

A project to bring WebAssembly plugins to Godot: https://github.com/ashtonmeuser/godot-wasm

WasmEdge can be embedded in applications: https://wasmedge.org/docs/embed/overview

Wasmer can be embedded in applications: https://blog.wasmer.io/executing-webassembly-in-your-rust-ap...

Wasmtime can be embedded in applications: https://docs.wasmtime.dev/lang.html