Blizzard also uses bittorrent to distribute their games and all patches for their games. I'm not sure about other game companies, but I'd be surprised if Blizzard was the only company doing this.
League of Legends also uses it in their download client.
I bet you use bittorrent more than you realize. There are at least several, that I know of, content distributors that package their own bittorrent client in their "downloader" (think what happens when you install chrome).
Chrome uses Bit torrent on its installer?
I'm not sure. I mean the types of installers where it's "download our downloader", like what chrome does.
Libre Office uses torrents too.
This. I love the concept of peer to peer services like bittorrent. I just wish they were used more often for legitimate downloads.