Luvalley is a lightweight type-1 Virtual Machine Monitor (VMM) with novel architecture, to enable any OS to host virtual machines as pure applications by utilizing hardware virtualization extensions such as Intel VT and AMD-V.
LogoROS is new object-oriented operation system (currently in early development). See wiki page: https://sourceforge.net/apps/mediawiki/logoros/ and development blog: https://sourceforge.net/apps/wordpress/logoros/ for more info.
A simple emulator and interpreter application with an Assembly-like integrated language. Written in C#. Works with .NET Framework 2.0/3.0/3.5 and Mono 2.0
OpenGL apps running inside a VM use VMGL to obtain graphics hardware acceleration. VMGL supports VMware, Xen PV and HVM, qemu, and KVM VMs; X11-based OS such as Linux, FreeBSD and OpenSolaris; and ATI, Nvidia and Intel GPUs.
Terra-Terra is a virtual operating system, giving the full power of an OS to your internet server. Application developers can build webbased application for Terra-Terra, using its user interface, security system, RTL etc as with any OS.
The OS561 operating system based around FORTH/Java. The OS is to run on a VHDL chip OpenHardware design called the Minon, but could become available for other platforms. The unique point of the design is a revolutionary data compression technology.
OS for embedded and mobile devices based on tiny byte-code interpreter and FORTH language compiler (into platform-independent byte-code). In other word its smallest programming language realization works on any type computer with any OS