Try RNT
without installing it.
The kernel and every subsystem the host runs, compiled to WebAssembly and started in this tab. There is no server behind it: your database lives in this browser, and nobody else sees it.
≈ 2 MB download
runs entirely in this tab
best with a mouse and keyboard

A whole RNT desktop: the object browser, a workspace and a prompt for every subsystem.
Nothing loads until you press it.
What runs
The kernel with pureSQL, Forth, Dandelion, Aleph, Shoji, Soroban, Tangram,
Kintsugi and Omikuji, with Chess and Shogi installed under \application,
as the host installs them.
Where your data goes
Nowhere. The database is LMDB, kept in this browser's storage, so it outlives a reload. Reset database deletes it, and so does clearing the site's data.
What's left out
Sakura, which the host doesn't run. History lives in memory, as on the native host, so a reload starts the journal over.