free drum machine software (linux, windows)

The orDrumbox is a free drum machine software, designed to be as creative as possible with unusual features : auto-composition, polyrythmes, unusual arpeggiator, automatic sounds/track matching , custom softsynths, lowfi rendering, etc.
This tools can compose bass line and complete songs using included drum kits with the audio sequencer functions.
http://www.ordrumbox.com/download.php

Hydrogen (linux): http://hydrogen.popez.org/hcms/node/21

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