KA9Q NOS TCP/IP Package
   Second known implementation of Internet protocol (IP) for low-end computers; can at once be network client, server, IP packet router; support multiple client and server sessions. Description, downloads, zip format. Original author.
   http://www.ka9q.net/code/ka9qnos/

Network Research Group
   University of California, Irvine.
   http://bolero.ics.uci.edu/

Systems Research Group, Networks and Operating Systems
   University of Cambridge, Computer Lab. Many interesting network OS oriented projects, including Nemesis OS.
   http://www.cl.cam.ac.uk/Research/SRG/netos/