PETROS By Trumpet Software International, 32-bit microkernel OS for x86 PCs coded in Object Pascal variant. Built from first principles to focus on small size, modularity, and be fully compatible with Win32 and industry standards; reads FAT-12/16/32. Low cost; free time-locked demo. http://www.petros-project.com/

BugOS New microkernel operating system for x86 computers, many features: network and Internet modules, file system (FAT); kernel handles memory, tasks, micro kernels, and some base devices: keyboard, video, hdd, and ramdrive. http://bugos.nop.hu/

Microkernel-based and similar Operating Systems Includes links and brief descriptions of microkernal based operating systems. http://www.cs.arizona.edu/people/bridges/os/microkernel.html

The Open Group: Advanced Research Page listing several research projects: microkernel OSs (MK7, MK++, AD3) and other modules (CONVERSANT, CORDS, GIPC, SHAWS). http://www.osf.org/RI/

Microkernel-based OS Efforts By Christopher Browne. Brief, clear descriptions and critiquing of microkernel design concepts, with some links. Puts much current activity in larger context. http://www.cbbrowne.com/info/microkernel.html

React Effort to clone Windows NT OS; goals: to run without change Win32 programs (binary application compatibility), Windows NT drivers (binary driver compatibility); needs i486, 16 MB RAM, 40 MB free disk space. [Open Source, GPL] http://reactos.wox.org/

Convergence International The non-Wintel user group, supporting Acorn, Amiga, Apple, ARM, Be, NCs, PowerPC, Psion, Unix and other alternative operating systems. Services include a non-Wintel news summary. http://www.convergence.org/