[expert] SNMP mapping?

[Vanco, Donald]

Hello -
        Slightly off topic.... but:
        Anyone seen a tool for mapping SNMP devices?  I've done a quick
search for SNMP @ FreshMeat.net and found a few possible tools, but none
really have that great of a description - do any of you have any experience
with such a tool?  I'm looking for something that can map a network topology
similar to HP OpenView or Sun NetManager.  Have any high level tools been
ported to Linux? 
        Pointers appreciated...
Thanx
Don