VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
4k Video Downloader - 4K Video Downloader is a software program that helps people download video files from sites such as Facebook, YouTube and Dailymotion.
SMPlayer - SMPlayer is a free video and audio player for both Windows and Linux that allows you to play almost all media files without having to install additional codecs. Read more about SMPlayer.
Video DownloadHelper - Browser extension to download videos from the Web
MPV - MPV is an audio and movie player based on MPlayer and mplayer2.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.