WiFi Warden is described as 'lets you see frequency, channel, modem manufacturer, encryption, security,distance to the router, power, name and Mac address of wireless access points around you and show some information about connected devices to your network' and is an app in the Network & Admin category. There are more than 25 alternatives to WiFi Warden for a variety of platforms, including Android, Windows, Android Tablet, Mac and Linux. The best alternative is inSSIDer. It's not free, so if you're looking for a free alternative, you could try Wifi Analyzer or WiFi Analyzer. Other great apps like WiFi Warden are NetSpot (Freemium), Vistumbler (Free, Open Source), WiFiman (Free) and Acrylic Wifi (Freemium).
Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router. It turns you android phone into a handy Wi-Fi analyzer! App Permissions (from Google Play) Version 3.8.
Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and (with appropriate hardware) can sniff 802.11b, 802.11a, 802.11g, and 802.11n traffic.
Easily analyze your Wi-Fi and see the issues preventing you from having a stable and fast connection. You can run a comprehensive scan of your wireless network, get an interactive color-coded heatmap, and see the "dead" zones clearly.
A 802.11 wireless scanner and connection manager for Mac OS X. WiFi Scanner will detect access points and clients in ad-hoc mode if the SSID is being broadcasted. It can be used for wireless site surveys, wireless discovery, and to connect to WiFi networks.