Wikipedia
Videostream
Videostream is a Google Chrome application that streams video, music, and image files wirelessly to Google's Chromecast.
Stating that it's the simplest and most reliable way to stream videos to your Chromecast, in one click it will take any local video file and play it wirelessly onto any Chromecast. Under the hood, Videostream transcodes the audio and video of incompatible files into a format supported by the Chromecast. The product received favourable reviews by the sites Engadget, Lifehacker and Techzilla, all of which praised the software's ease of use and ability to handle multiple video formats.
Videostream was first launched in February 2014 and is built and maintained by a team in Waterloo, Ontario.