Vuze Bittorrent Client is a free software allowing you to download files thought BitTorrent network. Vuze is written in Java, and uses the Azureus Engine. The software can by used to download files linked to .torrent, and also users can view, publish and share HD video.
Atom is a desktop application built with HTML, JavaScript, CSS, and Node.js integration. It runs on Electron, a framework for building cross platform apps using web technologies. Atom download links available.