Factolex

Availiable in English or German, Factolex is a community-powered fact repository where users can create and edit facts or create their own lexicons. The Factolex API allows developers to search and retrieve terms from the Factolex database, as well as view individual users' lexicons. The API is a RESTful API and data can be returned in an HTML, XML, or JSON format. No API key or account is required as of right now to use this API.