OpenSignal launched two years ago with hopes of compiling a database of cell phone towers, cell phone signal strength and Wi-Fi access points around the world.
Our API directory now includes 146 location APIs. The newest is the LongLatToLocation API. The most popular, in terms of mashups, is the foursquare API. We list 86 foursquare mashups. Below you'll find some more stats from the directory, including the entire list of location APIs.