MIDI Choir will take a single-pitched audio source and transpose it in real time according to the supplied MIDI notes. Create MIDI Choir was to be able to sing harmonies live, however the product may also be used for studio work.
LMMS is a free cross-platform software which allows you to produce music with your computer. This covers creating melodies and beats, synthesizing and mixing sounds and arranging samples. You can have fun with your MIDI keyboard and much more – all in a user-friendly and modern interface. Furthermore LMMS comes with many ready-to-use instrument and effect plugins, presets and samples.
Mixxx has everything you need to start making DJ mixes in a tight, integrated package. Whether you’re DJing your next house party, spinning at a club, or broadcasting as a radio DJ, Mixxx has what you need to do it right.
Rosegarden is a music composition and editing environment based around a MIDI sequencer that features a rich understanding of music notation and includes basic support for digital audio.
Wavosaur is a free sound editor, audio editor, wav editor software for editing, processing and recording sounds, wav and mp3 files.