TokBox OpenTok API

OpenTok is a free set of APIs from TokBox that enables websites to weave live, group video communication into their online experience. TokBox is a web application that allows users to make multi-party video chat calls over the Internet without a download. With OpenTok users can: control size, layout and movement of video streams; stream to multiple pages and sites at once; create both "viewer" and "participant" roles; scale to large gatherings. The API uses RESTful protocol with responses formatted in XML.