Taginfo has the “mission” of aggregating all available information about OSM tag usage and present it to the users. The main sources of information are the OSM database and the documentation in the OSM wiki. But there are many more sources of information to be tapped. Everybody who creates a map, or writes presets for an editor, everybody writing a data export program or a routing application has to decide which tags to use in what way. All this is useful information, but it is hard to come by. Everybody uses different programming languages and different config file formats. And all this “stuff” is spread out over many software repositories and web sites.