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Nullsoft is a software house. As a team of developers, they have created several popular computer programs, notably the media playback software Winamp and the streaming MP3 server Shoutcast.

The company's name is a humorous take on Microsoft, noting that null is smaller than micro. Nullsoft was acquired by America Online in 1999, and now exists as a subsidiary.

Nullsoft created NSIS, an open source, scriptable, installer system. The program is now a widely used alternative to InstallShield. Their latest developments include the Nullsoft Streaming Video (NSV) format, whose goal is to be easily streamed, and to support any audio and video codec. NSV is being used on Nullsoft Television. NSV is the only format accepted by Nullsoft's Worldwide Public Access Television.

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