The main feature of music notation software should be the facility to produce high quality sheet music the easy way; enter music notes as simple as possible, using either PC-keys, mouse, or a MIDI-keyboard.
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QAbc Alternatives
QAbc is described as 'Minimal but useful GUI for ABC music composition. This program allow to write music in the ABC syntax and play, preview and print the sheet music' and is an app in the audio & music category. There are more than 10 alternatives to QAbc for a variety of platforms, including Windows, Mac, Linux, iPad and iPhone apps. The best QAbc alternative is MuseScore Studio, which is both free and Open Source. Other great apps like QAbc are LilyPond, Band-in-a-Box, Frescobaldi and EasyABC.