Some notes:<p>-It's built in tandem with a OS, Isaac, that is using the OO features as a central part of the design.<p>-It's not complete yet. It's a few years into the project, but the specification may still change. So it's more interesting toy than production-ready right now.<p>-It compiles to C code and can directly inline C statements with a simple backquote syntax so it has good compatibility with existing systems, even though it's meant for a research OS.