Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Emit - Emit can stream from a Windows/Mac/Linux machine to an android/iOS device.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
VPlayer - VPlayer - a free music player for VKontakte.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Vinyl Music Player - A fork of Phonograph Music Player that "makes all Pro features free, as they used to be".