If you have to design or troubleshoot an enterprise wireless LAN it might be helpful to have some software tools available. Here are some of my favorites:

Find other systems or components and check if they have an influence on your WLAN

• wi-spy with chanalyzer software to analyze the frequency spectrum
• network stumbler to detect other WLAN infrastructure components

Packet Analyzing on LAN and WLAN

• Wireshark with Pcap and AirPcap

Site Survey, planning, simulating, designing of the wireless network

• Ekahau Site Survey

Related posts:

1. Network Management of LAN,WAN,WLAN components
2. Security of systems that have network access