Opera allow you to download torrents (BiT torrent protocol) directly via its interface, without using any P2P client:
E.g upon downloading a magnet link (E.g downloading Ubuntu) under Opera, you shall be prompted to choose if you want to start downloading your torrent via Opera
or the P2P software installed on your system.
Click on Save and choose a location to store your file and press OK to start the download.
You can view the progress of the operation at any time , in the Opera download manager (CTRL +J)