Movitz is a Common Lisp implementation that targets the x86 PC architecture "on-the-metal". Its intended use is for embedded, single-purpose systems, or operating system kernels.

You can read more about Movitz (as well as browsing the source and the mailing lists) at

The current technical documentation is available now (and 403 Forbidden).

The instructions on how to build and boot it are on the project's Trac