The best open source video converters that we know of, for Windows, Mac, and Linux.

Open Source Video Converters

• Download Page Mac App Store (free)

  Miro Video Converter

  A super simple way to convert almost any video to MP4, WebM (vp8), Ogg Theora, or for Android, iPhone, and more. Windows, Mac, and Linux. Free and open source.
• Download Page

  VLC

  More than just a media player, VLC can also convert videos to various formats on Windows, Mac, and Linux. Free and open source.
• Download Page

  Handbrake

  Handbrake is probably the most popular free and open-source converter for working with H.264 video. Windows, Mac, and Linux.
• Download Page

  WinFF

  A video converter for Windows and Linux based on the great FFMPEG utility. Free and open source. 

Standalone App

• Download Page

  Miro

  Miro can play any video format, download torrents, permanently save videos from YouTube, and watch video podcasts. Beautiful interface, 100% free and open source.

Firefox Add-ons

• Download Page

  Flashgot

  Download one or all of the links, movies and audio clips on a page with a couple clicks.
  
• Download Page

  Flash Video Downloader

  Downloads videos from Youtube, Dailymotion, and more.