iSkysoft Free Video Downloader, a limited version of http://alternativeto.net/software/iskysoft-itube-studio-for-mac/ , lets quickly and easily download videos from YouTube. It automatically detects the video on YouTube opened in Safari, Chrome or Firefox with a single click. You can save your favorite YouTube videos, even HD YouTube videos, to your Mac or PC instantly.
Automatic video detection and one-click to download.
Start downloading as soon as the YouTube video starts to load.
Built-in video player for the convenient playback of FLV/MP4 videos on Mac.