Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
4k Video Downloader - 4K Video Downloader is a software program that helps people download video files from sites such as Facebook, YouTube and Dailymotion.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
Video DownloadHelper - Browser extension to download videos from the Web
Askalot - Askalot is a next generation CQA (Community Question and Answer) system.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.