There are 2 repositories under abcnotation topic.
tool for musicians to manage abc notation
React component for showing and writing abc notations using the Abcjs library
UtimateScale is a music scale learning assistant that built-in synth keyboard supporting various keys, efficient learning through quizzes is possible. (Available on App Store)
A simple Editor with a preview function for the ABC notation format (http://abcnotation.com/) written with perl/pEFL