Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
Video DownloadHelper - Browser extension to download videos from the Web
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Askalot - Askalot is a next generation CQA (Community Question and Answer) system.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.