PMON 2000 is a firmware that was orginally developed by swedish company called Opsycon, but the copyright notice also mentions Rtmx Inc and ipUnplugged AB. It is based on PMON but has been modified significantly. The code is licensed under a four-clause BSD licence. More info including commercial support is available on the PMON 2000 site. Regretfully the website has not been updated for some time as develoment of the PMON2000/SDK have taken up all time. Source should be available from anoncvs.pmon2000.com.