Rumor

Version: 1.0.3b Rumor is a realtime monophonic (with chords) MIDI keyboard to Lilypond converter.

It receives MIDI events, quantizes them according to its metronome on the fly and outputs handwritten-like corresponding Lilypond notation. Tempo, meter, key and other parameters can be set via command-line options.
Rumor's only purpose is to help out with music transcriptions (even of polyphonic music with separated voices); typical usage is to write Lilypond file skeleton by hand and then paste Rumor output into it. It does not want to be a full-blown quantization program; fancy features like tuplets, polyphony and tempo tracking were ommited deliberately.

It uses relative notation and omits note length if it has not changed (both can be switched off though)
It writes rhythms intelligently, in relation to bar position (tied single notes, over barlines if necessary)
It resolves enharmonic ambiguities (e.g. gis/as) given the --key=NOTE option
It is scriptable, with support for user-defined rhythm notations, keyboard layout and pitch names (dutch and italian being built-in).
It supports chords (simlutaneous notes), using the <c e>8 syntax.
It can talk to MIDI I/O via ALSA or OSS.
It can emulate MIDI keyboard using ordinary (computer) keyboard, key layout being scriptable.