The Dude - MikroTik is a Latvian company which was founded in 1996 to develop routers and wireless ISP systems. MikroTik now provides hardware and software for Internet connectivity in most of the countries around the world.
Wireless Network Watcher - scans your wireless network and displays the list of all computers and devices that are currently connected to your network.
Pandora FMS - Pandora FMS: Opensource monitoring software
WifiInfoView - Scans wireless networks in your area and displays extensive information, including: SSID, MAC Address, PHY Type (802.11g or 802.11n), RSSI, Signal Quality, Frequency, Channel Number, and more...
OpenNMS - Project home page of OpenNMS - a java based network managememnt platform developed under the Open Source model
My WIFI Router - Wifi Hotspot creator for Windows