Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Twitter Video Downloader - Download Twitter Videos - Online, free twitter video downloader.
Video DownloadHelper - Browser extension to download videos from the Web
TubeOffline - . Fast & Easy to use! 2.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Tvidder - Tvidder helps download video from your friends' tweets. It's easy to use, it's fast, and it finds video in 20% more posts than competitors. Tvidder can also convert twitter video to mp3.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.