FlashGot - FlashGot is a browser extension for Mozilla Firefox that is designed to make it easy to download a whole batch of files in one go. The extension is open source and free to use, but it is no longer compatible with the most recent version of Firefox.

qBittorrent - Lightweight and open source torrent client that runs on all major platforms.

Video DownloadHelper - Browser extension to download videos from the Web

Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.

ClipGrab - A friendly downloader for YouTube and other sites

BitTorrent - BitTorrent is a peer-to-peer program developed by Bram Cohen and BitTorrent, Inc.