SnapTube!

Yourtube adds a fully integrated downloader to the YouTube app of your jailbroken iPhone or iPod Touch, so you can keep those great videos that you love to watch.

Download videos from YouTube, Rai, Rai Replay, Video Mediaset, La7, Witty TV, Dplay and lots of other websites!

Augmentable with front-ends such as Youtube-DLG , youtube-dl is a small command-line program to download videos from YouTube and a hundreds other sites. It requires the Python interpreter and is therefore platform-independent.

Freemake Video Converter is video converter that lets convert videos to avi, wmv, mp4 (iPhone, iPod, iPad, PSP, xBox), 3gp, rip dvd, extract mp3, burn DVD and Bluray, create photo slideshow and audio visualization, cut, join, rotate and upload videos, photos and music to YouTube.

4k Video Downloader allows to download video, audio, subtitles, channels and playlists from YouTube in high quality and to save it on your computer. This program is free for downloading videos and playlists of no more than 25 videos. This limitation may be removed by paying a license fee.

Youtube Video and Audio Downloader is an open-source project, downloading Youtube videos (using Firefox download manager) in all available formats (FLV, MP4, WebM, and 3GP) with video quality of your choice. It also contains a pure JavaScript library to extract the original audio file out of FLV videos. It also shipped with an offline tool to extract audio files out of FLV videos.

A cross platform front-end GUI of the popular youtube-dl written in wxPython.

Freemake Video Downloader is a free video downloader that lets download videos from YouTube, Google, Facebook, Dailymotion and other sites either in HD, 4K, MP4, FLV, 3GP or convert web videos to FLV, AVI, MP4, MP3.

FlashGot is the free add-on for Firefox and Thunderbird to capture embedded links for all types of files (not just flash movies). -Capture all links from a page-Capture all links from all tabs-Make a selection on a web page and capture all links in that selection.-Filter the links using a mask (e.g. to download only certain types of files)-Pass on the links to your favorite download manager

Allows to download videos for offline viewing to the sdcard of the device. Google controversially remove all YouTube downloaders from Google Play (Android Market), but it is available at other Android markets such as SAM - SlideME Application Manager . This app is not Open-source and contains advertising, but it is free.

MediaTap is a powerful, fast and easy-to-use application for downloading media files from the Internet. With Mediatap, you can download any type of files such as videos, music, photos and PDFs straight to your phone. Once the files are downloaded, you can watch them, listen to them, and read them ANYTIME ANYWHERE without worrying about internet connection!

ClipGrab is a free downloader and converter for YouTube, Vimeo, Metacafe, Dailymotion and many other online video sites.It converts downloaded videos to MPEG4, MP3 or other formats in just one easy step.Downloaded videos can be converted to the following file formats: WEBM, WMV, MPEG4, OGG Theora, MP3 (audio only), OGG Vorbis (audio only).