_(MIA) (Knewcleus | http://openworld.d-design.net/) is a _(microkernel)-based _(OS) that aims for _(POSIX) compliance; while open sourced, the people behind it intend to make it a commercial venture and release a packaged version that will include additional things not present in the opensource version. There is documentation on the site and code can be downloaded via CVS. Work has just started on adding _(real-time) capabilities to the system.