NetStumbler - Official source of information about Netstumbler.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
tcpdump - tcpdump is a common packet analyzer that runs under the command line.
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
NetworkMiner - NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows.
Paessler PRTG - An advanced network monitoring solution to monitor network up/downtime, traffic and usage.