sanos

Sanos is a minimalistic 32-bit x86 OS kernel for network server appliances running on standard PC hardware. The kernel implements basic operating system services like booting, memory management, thread scheduling, local and remote file systems, TCP/IP networking and DLL loading and linking. You can use sanos as a small kernel for embedded server applications written in C. Sanos has a fairly standard POSIX based API and an ANSI Standard C library.

The kernel was developed as part of an experiment on investigating the feasibility of running java server applications without a traditional operating system only using a simple kernel.