LMMS (Linux MultiMedia Studio)
LMMS is digital audio workstation that allows you to produce music with you own personal computer. This includes the creation of melodies and beats, the synthesis and mixing of sounds, and arranging of samples while playing on a MIDI keyboard by combining the features of trackers, sequencers and synthesizers, you can have fun creating music all in a user-friendly and modern interface. Features include: Song-Editor for arranging the song, Creating beats and basslines using the Beat-/Bassline-Editor, Easy-to-use piano-roll for editing patterns and melodies, Instrument- and effect-plugins, Support for hosting VST(i)- and LADSPA-plugins (instruments/effects), Automation-editor, MIDI-support. This is free software and is available for the Linux, Mac OS X and Microsoft Windows Operating Systems.