Android: Constantly scanning for Wi-Fi networks can be a big battery drain. Wi-Fi Matic reduces this problem by only enabling Wi-Fi when you're near a network you frequently connect to, and detecting your location via mobile networks.
Disabling Wi-Fi when away from home or work is nothing new, but this app stands out by allowing you to automate the process with your location without using GPS, which is also a big battery drain. While your phone is already checking for mobile tower connections, GPS checks are only necessary for fine location. Since Wi-Fi Matic only detects coarse location, the strain on your battery should be minimised, in addition to requiring very little set up (compared to an option such as Tasker).