Comment by neweggrma

Eclipse Theia: https://theia-ide.org/

It's an open source project bringing the VS Code user interface to the browser. It supports a large number of VS Code extensions.

It is by-far the stand-out in this arena, and yet seems to be sadly very unknown. VS Code Liveshare and friends are all proprietary junk, to be polite.

GitPod.io is a directly usable end-user product.

Theia is used by Google, ARM, Arduino, IBM, Huawei, Ericsson, Red Hat, and more. It's seriously good stuff.