How to watch torrent without downloading it

This one will save your disk spaces and let watch torrent file instead downloading it first.

Introducing Watchtorrents
WatchTorrents Player is a browser plugin that lets you play the contents of a torrent file without downloading it. Once the WatchTorrents player is installed on your PC you can right-click on the "Download Torrent" link on any of your favorite torrent trackers and select "Play torrent". Just press it and your torrent file contents will start playing almost immediately.