Google's Chromecast is a fantastic and easy way to stream videos from your computer to your TV, but even the workarounds to enable streaming of any video require Chrome. Castnow is a command line utility that will stream videos, music, and even torrent files.
Castnow works independently of Chrome and entirely from the command line. You can set it so it plays a single local video file, an entire directory, a web video file, YouTube clips, a YouTube playlist, a torrent file with a magnet link, and even do transcoding. The torrent streaming is a bit clunky and slow, but everything else works great. If you don't feel like messing around with Chrome, this is a nice lightweight solution.