Sakura is a Knowledge Navigator and User Interface for UNIX, which implements HyperMedia and its own windowing and packing system, both in the main program and in an extensive API for Tcl and other languages.
The Isis OS Project Is a Controlled Project to Develop An Advanced Modern Operating System!
It's a new GNU/Linux distribution, based on Linux From Scratch, with focus on easy complete and non-redundand system administration made with a simple textual command-line interface and in the interoperability with Windows (Further with other OS).
ButterflyOS is a very simple operation system for the Atmel AVR Butterfly board. It's based on the AvrX multitasking scheduler, created by Larry Barello. A byte-code program for ButterflyOS, can be sent and managed through the serial interface.