iOS/Android: If Maslow were to revise his hierarchy, Wi-Fi would be down there by the base, right between psychological and safety needs. For those of you thirstier for Wi-Fi than you are for water, WiFi Map is an app that shows over 2.1 million Wi-Fi hotspots around the world.
When you first open the app, WiFi Map asks for permission to access your location. It definitely lives up to its claim -- you'll probably find places with either open or password protected Wi-Fi access that you pass by everyday. (I sure did!)
However, the free version only shows the Wi-Fi hotspots within 2km of your immediate or searched. There were still over a dozen locations for my immediate location (and four or five for a searched one), so I'm not complaining. At the time of writing, if you copy and paste an address into search, you should be able to access the location's WiFi Map listings. The paid version, available through in-app upgrade, allows for a greater set of listings and for you to save maps and access them offline.
Nonetheless, the free version will be useful for students or freelancers who are looking for new places to work, or if you're stuck out of the house and have some time to kill.