4vid!

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.

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

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.

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.

RealPlayer with RealTimes (aka “RealPlayer” for short) still includes the legacy features, such as Video Player, Downloader, Converter, Organizer and Web Videos. It also includes RealTimes features, such as Photos and RealTimes Stories, the automatic video collage feature.

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).

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.

Deturl.com helps you download videos and MP3 music from YouTube, Facebook, Break, MetaCafe, DailyMotion, Vimeo, and many other sites, including adult sites. Deturl is a meta-site that links you directly into many different downloading tools and more.

Download YouTube music from your browser and save it in MP3, M4A or OGG with the best possible quality.

TubeMaster++ is a powerful tool which can capture multimedia files you are watching or listening from your internet browser (FLV,MP3,MP4). Captured files can be saved directly on your computer or converted to other popular video or audio formats (AVI, MPEG, MP3, MP4, IPod, PSP ...). Websites examples : YouTube, DailyMotion, MySpace, Google Videos, LastFM, Grooveshark and many others ... Powerful search engines are also integrated to find videos or audio (mp3) files directly from the software.