kazaa

Kazaa is a peer-to-peer file sharing application, similar to that of Limewire and Imesh.

According to Wikipedia.com:

"Kazaa is now run under license as a music subscription service by Brilliant Digital Entertainment, Inc.

Kazaa Media Desktop was commonly used to exchange MP3 music files and other file types, such as videos, applications, and documents over the internet. The Kazaa Media Desktop client could be downloaded free of charge; however, it was bundled with adware and for a period there were "No spyware" warnings found on Kazaa's website. During the past few years, Sharman Networks and its business partners and associates were the target of copyright-related lawsuits, related to the copyright of content distributed via Kazaa Media Desktop on the FastTrack protocol."

Kazaa was originally created by the Estonian team behind Skype and Joost.