Apps similar to Harmony Assistant include MuseScore Studio, which is free and open source. Other options are TuxGuitar, Guitar Pro, Rosegarden and Avid Sibelius. There's no shortage of Music Production Apps like Harmony Assistant, with more than 25 alternatives for Windows, Mac, Linux, Android and iPhone.
Groovyband Live! is a realtime arranger software that runs on any Windows PC (tablet, laptop, desktop), interfaces with MIDI input devices (keyboards, pedal board, control surfaces) and produces a live stream of MIDI events to drive a suitable sound generator.
Busker is a complete set of tools to create musical arrangements from sheet music (chords + melody staff). It uses Yamaha compatible styles (thousands can be downloaded for free) for auto-accompaniment.
A browser-based auto-arranger: type in a chord chart, pick a style, and get an instant backing track you can transpose, mix, play through an external MIDI device and export as MIDI.
MidiYodi is a cross-platform MIDI Editor for the desktop that allows editing, examination, playback and conversion of MIDI files. MidiYodi provides a rich set of tools to examine and edit the layout, structure and content of a MIDI file.
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