Name

Net-SNMP (Formerly the UCD-SNMP project.) — http://net-snmp.sourceforge.net

Platforms

Many flavors of Unix, Windows 9x/NT

Pros

Free and fairly robust. Easily extensible using shell or Perl scripts. Includes a trap daemon.

Cons

Documentation is minimal, which means it can be difficult for first-time users to get it running the way they want.

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