EasyABC

An open source ABC editor for Windows, OSX and Linux. It is published under the GNU Public License.

Features

Good ABC standard coverage thanks to internal use of abcm2ps and abc2midi
Syntax highlighting
Zoom support
Import MusicXML, MIDI and Noteworthy Composer files.
Export to MIDI, SVG, PDF (single tune or whole tune book).
Select notes by clicking on them and add music symbols by using drop-down menus in the toolbar.
Play the active tune as midi (using SoundFont)
See which notes are currently playing (Follow score)
Contextual guidance (ABC Assist)
Record songs from midi directly in the program (no OSX support at the moment).
Just press Rec, play on your midi keyboard and then press Stop.
The musical score is automatically updated as you type in ABC code.
Support for unicode (utf-8) and other encodings.
Transpose and halve/double note length functionality (using abc2abc)
An abcm2ps format file can easily be specified in the settings.
ABC fields in the file header are applied to every single tune in a tune book.
Automatic alignment of bars on different lines
Available in Italian, French, Danish, Swedish, Dutch and English
Functions to generate incipits, sort tunes and renumber X: fields.
Musical search function - search for note sequences irrespectively of key, etc.

abcm2ps for converting ABC code to note images (developed/maintained by Jean-François Moine)
abc2midi for converting ABC code to midi (by James Allwright, maintained by Seymour Shlien)
xml2abc for converting from MusicXML to ABC (by Willem Vree)
abc2xml for converting from ABC to ABC (by Willem Vree)
nwc2xml for converting from Noteworthy Composer format to ABC via XML (by James Lee)
wxPython cross-platform user-interface framework
scintilla for the text editor used for ABC code
python midi package for the initial parsing of midi files to be imported
pygame (which wraps portmidi) for real-time midi input
FluidSynth for playing using SoundFonts
Many thanks to the translators: Valerio Pelliccioni (italian), Bendix Rødgaard (danish), Frédéric Aupépin (french). Universal binaries of abcm2ps and abc2midi for OSX are available thanks to Chuck Boody.