g up (precious) disk space. It's not hard to get an LFS system installed under 100 MB. Does that still sound like a lot? A few of us have been working on
Plan 9 from Bell Labs is a distributed operating system, primarily used for research. It was developed as the research successor to Unix by the Computing Sciences Research Center at Bell Labs between the mid-1980s and 2002. Plan 9 is most notable for representing all system interfaces, including those required for networking and the user-interface, through the filesystem rather than specialized interfaces. Plan 9 aims to provide users with a workstation-independent working environment through the use of the 9P protocols. Plan 9 continues to be used and developed in some circles as a research operating system and by hobbyists.
Haiku is an open-source operating system currently in development designed from the ground up for desktop computing. Inspired by the BeOS, Haiku aims to provide users of all levels with a personal computing experience that is simple yet powerful, and free of any unnecessary complexities.
Nexenta Operating System is a free and open source operating system combining the OpenSolaris kernel with GNU application userland. Nexenta Operating System runs on Intel/AMD 32/64bit hardware and is distributed as a single installable CD. Upgrades and binary packages not included on the CD can be installed from NexentaOS repository using Advanced Packaging Tool. In addition, source based software components can be downloaded from network repositories available at Debian/GNU Linux and Ubuntu Linux, and built as described here.
Nexenta Operating System is a free and open source operating system combining the OpenSolaris kernel with GNU application userland. It System runs on Intel/AMD 32/64bit hardware and is distributed as a single installable CD.