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Written in C
OS family Real-time operating systems
Source model Open source
Latest preview 0.9.0 / 1 October 2009; 6 years ago (2009-10-01)
Platforms x86, ARM, PowerPC
Kernel type Microkernel
License BSD license
Official website Prex

Prex is a portable 32-bit embedded real-time microkernel operating system. The kernel is compact, under 25k bytes, and provides memory management, inter-process communication (messages and shared memory) and multithreading in the kernel, and leaves more application-specific features like a file system to be implemented. It is designed to have virtual memory and memory protection when available. It is currently pre-beta, but runs on x86 PCs and the Game Boy Advance.

It has a POSIX emulation layer.

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