The document discusses Tokbox and Opentok, which are services that allow for easy videoconferencing. It notes that Opentok uses WebRTC and Flash for videoconferencing and has client APIs for JavaScript, iOS, and Android as well as server APIs for languages like Ruby, Python, NodeJS, PHP, and .NET. The document demonstrates Opentok and notes that while it supports video sessions with publishers and subscribers, it does not provide messaging or transmission of data during sessions.