Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Postys - Day's best, handpicked videos trending on YouTube.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Pluto.tv - Pluto. tv is an app that allows users to stream Internet television channels. The app sources its programs from services like YouTube and Vimeo, and it has also partnered with Hulu to offer access to more programming.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Findie - Lean back and explore the world's best cinematic videos