Website Downloader - Download source code from any website
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.
CONV. - Convert YouTube video to MP3, GIF or MP4
Video DownloadHelper - Browser extension to download videos from the Web
Image Cyborg - Download all images on a web page
ClipGrab - A friendly downloader for YouTube and other sites