Great Downloader easy to use can convert into multiple file formats. Fast and impressive
MadMapper - The Mapping Software
Video DownloadHelper - Browser extension to download videos from the Web
Resolume - Resolume is an application for live video performances.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Linux Show Player - Sound player designed for stage productions
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.