Great Downloader easy to use can convert into multiple file formats. Fast and impressive
CheatKeys - View Windows keyboard shortcuts in the current application.
Video DownloadHelper - Browser extension to download videos from the Web
cheat.sh - The only cheat sheet you need Unified access to the best community driven documentation
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
KeyCue - Menu shortcuts are supposed to provide quick access to frequently used menu commands.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.