If You want to share your internet connection, Direct dial will give you the ability to control your modem from ramote computer

A network traffic monitor and logger. Monitor all your network connections in real-time or browse historical reports. See what, when and where with a built-in packet sniffer. Automatically resolves IP addresses to hostnames. Supports proxies.

IMDetect ICQ Sniffer is a handy network utility to capture ICQ chat from computers within the same LAN. It supports messaging through ICQ server with format of plain text, RTF, or HTML. All intercepted messages are well organized by users.

Give Me Too is an easy-to-use network analyzer for Windows. It controls your LAN, captures all visited Web pages, sent and received emails and stores them to a folder of your choice. You can view the captured data using your browser or e-mail client.

Outlook Attachment Sniffer is an Outlook Add-In, which allows you to deal with specific tasks on emails, either automatically on incoming emails or on complete folders. Extract attachments - Export emails to disk - Copy/Move emails to another folder

Use DUNTrack to monitor, log & analyze your dial-up networking usage. Generate four different types of detailed reports about your usage pattern. With DUNTrack you also get a bunch of great tools which make the most out of your dial-up connection.

Packet sniffer (network analyzer or network sniffer) for network monitoring and troubleshooting. It allows you to monitor network operations, isolate & solve network problems, identify network bottleneck & bandwidth use, and detect vulnerabilities.

Sniffer of ICQ, IRC and email messages across a LAN in real time. Includes ARP-spoofer, allowing to capture network traffic behind switch-hubs