Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Remote Mouse - Turn your smartphone into a wireless touchpad and keyboard now!
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
KDE Connect - Integrate Android with the KDE Desktop
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Monect - Make the best use of sensors on smart device to control PC, simulate steering wheel, game-pad...