Video DownloadHelper - Browser extension to download videos from the Web
Nico Nico Douga Downloader - Download anime videos, audio music mp3, thumbnail images, manga from nicovideo.jp
FastestTube - Youtube fastesttube downloader will make your internet expirience faster harder beter stronger.How to merge video and audio .
FlashGot - FlashGot is a browser extension for Mozilla Firefox that is designed to make it easy to download a whole batch of files in one go. The extension is open source and free to use, but it is no longer compatible with the most recent version of Firefox.
StreamFab Downloader All-In-One - StreamFab Downloader All-In-One is a great tool that allows you to download videos from thousands of websites Amazon Prime, Hulu, Disney, HBO, Netflix, amongst others.
ClipGrab - A friendly downloader for YouTube and other sites