PaulOS is a reference implementation of an embedded operating system which supports a subset of POSIX geared for embedded realtime single process applications. It is written to allow applications to be developed under GNU/Linux or FreeBSD and then recompiled without changes for the target architecture. It features POSIX file descriptors, a TCP stack (LwIP) with a BSD socket API, an ANSI C library, a DNS resolver library, and a minimal pthread library. A number of GNU/Linux network applications have been ported to it.
