Free network management and device configuration tools. CatTools is a utility for managing network devices (routers, switches and firewalls). Automated configuration backups, password changes and scripted configuration commands. Supports Cisco, 3Com, Foundry, Extreme, Netscreen and PIX etc. Runs on Windows 98 or later. Can be run as a Windows service or interactive application.
linkFerret
Monitor your network traffic, display frames in brief, hex and detail windows, create reports, filter protocols, create link filters, and more. Filter based on protocol or link masks. Currently decodes 27 protocols now with 802.11 wireless planned.
PingCOPA Ping and Traceroute
PingCOPA, aids network monitoring and diagnosis with email and speech support. PingCOPA installs on all 32 bit Microsoft Windows operating systems (except 95). Speech is only available on systems with the Microsoft Text-to-speech engine installed.
DEKSI Network Monitor
DEKSI Network Monitor is an advanced, powerful, and feature rich tool that monitors servers located on your LAN, WAN, and the Internet. Windows 9X, NT, 2000, XP, 2003 Server, Vista compatible and can monitor the servers with any operating system.
LanTopolog
Provides automatic physical network topology discovery, network map visualization, detailed and searchable physical network topology map, monitoring device's state in real-time, ability to auto-discovery new devices, web browser-based access
LanTool
Manage your network. Determine, what computers are connected and who's logged on. Remotely shutdown, restart, lock the systems or logoff users. Get useful information about a remote system such as IP & MAC addresses, Transfer files, etc.