A few I've found but not tried out yet:
OpenSource:
http://www.freeipdb.org/
http://www.brownkid.net/NorthStar/
Windows:
http://myips.dzoul.com/main.asp
http://www.enterpriseip.net/
I make no promises as to applicability or suitability.
www.sourceforge.net
www.freshmeat.net
These two sites might yield some more hits.