IPSpaceMon 

SpaceMon makes it easy to watch network storage space and alert you from your current network monitoring package* or simply rely on notification email sent by SpaceMon when a resource dips below the amount of free space you specify.
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IPAppmon 

A life-saver application for those MIS specialists needing to guarantee up-time on desktop application style server utilities. Now network monitoring and even automatic re-starting of failed applications is possible.
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Netman Enterprise Trial 

Netman enterprise trial edition brings in a tool which combines personal productivity with enterprise level applications. It has tools for work group communication, network monitoring and software asset management.
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Net Spy Pro 

From the creators of AceSpy, Net Spy Pro is the ultimate network monitoring and administration software suite. Monitors all activity on any TCP/IP network, and includes realtime surveillance features that let you view and control any PC on your LAN.
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Monitor one 

A comprehensive, all-in-one and graphical all-in-one network monitoring software for network uptime and health monitoring. Provides sophisticated features for real-time monitoring and graphing using SNMP, trending, logging and long term analysis.
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Comtun Pro 

stealth network firewall, NAT software router, HTTP caching, SOCKS server, access control and authentication, built-in DHCP Server, dial-up control, VPN (PPTP and IPSec), network monitoring and management, banner blocking, firewall timing control
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