Microsoft Bing Translator SDK allows users to convert languages in web and client apps. Instructions to subscribe to the Microsoft Translator API are available. With this SDK, developers can create projects useful to reach international audiences, manage e-commerce sites, and convey messages to multicultural users. This SDK supported by Microsoft Bing provides all documentation on the site.
As a translation service powered by human translators and accessed via an API, Gengo has a fairly unique business model—an API-as-product that uses the API to engage a human workforce to carry out sophisticated business processes.