Sucubus is a free, open-source search engine which helps you find and download music and videos from all over the web.
Sucubus uses YouTube for video results and gives you the ability to save the videos into popular formats for your iPod, iPhone or even convert the video into an MP3 with a single click.
Sucubus also searches the web for MP3 files that people have chosen to share on the web. This makes it a great tool for retrieving files that are very rare and hard to find.
This open source application is licensed under GPL v2.