An open-source company, building in public.
Four projects, all self-hostable: Compute (Rust, Apache-2.0, public), Bench (Python, Apache-2.0, public), Simulate (TypeScript, Apache-2.0, public), and Stream (Python, running but not published).
Lumbridge runs Tera at tera.lumbridgecorp.com. It needs no account, and it is a static build — anyone who wants their own runs it with no database, no media server and no keys.