LanHelper 

Scan network with a powerful engine. Boot or shut down or lock your PCs. Execute commands remotely. Capture screen or manage processes remotely and more. Monitor servers' availability in LAN/WAN. No server program needed. Support XML.
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Nsauditor Network Security Auditor 

Nsauditor scan and monitor network for possible vulnerabilities,to see all open ports and service associated with connection,possible trojans associated with port.Over 35 network tools for scanning,sniffing,enumerating and gaining access to machines.
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