Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Downie - Video download for OS X. Downie supports at this moment over 1,000 different sites.
Video DownloadHelper - Browser extension to download videos from the Web
Save IGTV - IGTV Downloader - Save IGTV Videos on any device with the fastest IGtv video downloader.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Viddit.Red - Download Reddit Video - helps download video from reddit, with audio. works with many different reddit posts and embeds.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.