Bing Traffic API: The Bing Traffic API provides information about traffic incidents and issues, such as construction sites and traffic congestion. Traffic incident information is currently available for the United States and Canada. Users can also get information about traffic issues that met the criteria specified in the URL request, such as map area, incident type and severity. The API uses RESTful calls and responses are formatted in XML and JSON.
deCarta MapSearch Engine API: deCarta is a location based services provider. The Map Search Engine API gives developers the ability to implement local search on their web sites and applications. The API can search address and point of interest data sourced from content partners. Developers can also overlay their own searchable content onto the map. MapSearch Engine is “white label”, allowing customers to unitize their own UI, branding and content. The API uses RESTful calls and responses are formatted in XML, JSON, JSONP and XHTML.
Bonus: 40 real estate APIs