DeforaOS is a multi-purpose Operating System, providing an ubiquitous, secure and transparent access to the user's resources. It features a POSIX-compliant environment, and can work on top of existing systems (Linux, *BSD...). Its desktop environment is focused on usability, coherence and integration, with many applications available already. Developed with simplicity and efficiency in mind, it suits modern embedded platforms as well.
Official website: http://www.defora.org/