Free snmpv3 software for linux

Argus Monitoring System software is a system and network monitoring application.
It will monitor nearly anything you ask it to monitor (TCP + UDP applications, IP connectivity, SNMP OIDS, Programs, Databases, etc).
It presents a nice clean, easy to view web interface that will keep both the managers happy (Red Bad. Green Good.) and the techs happy ("Ah! thats what the problem is").
It can send alerts numerous ways (such as via pager) and can automatically escalate if someone falls asleep.
Main features:
- It is open-source available at no charge.
- It has a clean and intuitive web interface.
- The web pages can easily be understood by non-technical people.
- It can generate graphs of what is going on.
- It can monitor network connectivity (Ping test)
- It can monitor TCP/UDP ports
- It can monitor a wide variety of TCP/UDP applications (HTTP, SMTP, RADIUS, ...)
- It can monitor the output or exit code of a program (Program test)
- It can monitor the content of a web page (such as a shopping cart application)
- It can monitor the authoritativeness of a nameserver
- It can monitor SNMP OIDs (such as BGP status, UPS voltage, room temperature, ...)
- It can monitor the results of SQL queries
- It can monitor itself.
- It can be extended to monitor things that the author didnt think of
- It can notify someone (or many people) when something happens
- It can escalate, and notify someone else, if things dont get fixed.
- It can not alarm for known downtime (maintenance overrides)
- It will summarize and rate-limit multiple notifications to prevent paging-floods.
- It keeps historical statistics, for analysis or SLA verification.
- It scales well and can monitor many, many things.
- It can restrict users to viewing only certain items (user "views")
- It can restrict users access to certain features (access control)
- It can support IPv6.
- It can support SNMPv3.
- It can support l10n for your native language.
- It can support redundant multi-server configurations.
Enhancements:
- This release offers improved performance and scalability, adds support for additional tests, and adds support for failover and redundancy.

check_apc_pdu application can check load and outlet status of a APC PDU by snmp.

Usage:

usage:
-H (--hostname) Hostname to query - (required)
-C (--community) SNMP read community (defaults to public,
used with SNMP v1 and v2c
-v (--snmp_version) 1 for SNMP v1 (default)
2 for SNMP v2c
SNMP v2c will use get_bulk for less overhead
3 for SNMPv3 (requires -U option)
-p (--port) SNMP port (default 161)
-o (--on) Outlets (name or number) must be on
-O (--off) Outlets (name or number) must be off
-L (--seclevel) choice of "noAuthNoPriv", "authNoPriv", or "authPriv"
-U (--secname) username for SNMPv3 context
-c (--context) SNMPv3 context name (default is empty string)
-A (--authpass) authentication password (cleartext ascii or localized key
in hex with 0x prefix generated by using "snmpkey" utility
auth password and authEngineID
-a (--authproto) Authentication protocol ( MD5 or SHA1)
-X (--privpass) privacy password (cleartext ascii or localized key
in hex with 0x prefix generated by using "snmpkey" utility
privacy password and authEngineID
-M (--maxmsgsize) Max message size - usefull only for v1 or v2c
-t (--timeout) seconds before the plugin times out (default=15)
-V (--version) Plugin version
-h (--help) usage help