Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
foobar2000 - An advanced freeware audio player for the Windows platform.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Winamp - Winamp is a media player that allows users to play multiple-file formats, arrange media in a varied file-management system, and play unique media with AAC encoding.