Great Downloader easy to use can convert into multiple file formats. Fast and impressive
AceStream - AceStream is multimedia platform for video streaming.
Video DownloadHelper - Browser extension to download videos from the Web
WebTorrent - A streaming torrent client based on WebRTC which is based on TCP & UDP
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Peerflix - Streaming torrent client for Node.js
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.