TL:DR; LandPark Snmp allows you to rapidly create a comprehensive inventory of all the active elements of your network.
Download LANDPARK SNMP Shareware - Rating: 3.59
A serverless, text-based, chat application for use on LANs. It supports: A simple and easy to use interface, sounds on message receipt, user grouping, URL/email highlighting, file transfer, encryption of messages, user blocking, smilies and icon tray plac
TCP Splitter is a software tool that can split a TCP or UDP data stream into two or three identical data streams
Ping Scanner Pro has 18 network tools, it can ping one address a lot of times or a lot of addresses one time. It will also tell you what MAC addresses are on your subnet, and perform DNS lookup or reverse DNS lookup. It does Traceroute, Whois.