Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Kite Compositor - A powerful animation and prototyping application for Mac & iOS.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.