Free Clef is a Home & Education software developed by D'Accord Music Software. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Free Clef:
BSEditor: Free Clef is D'Accord Music Software's free musical score editor.
With Free Clef, musicians, music teachers and music students can create, edit and print their own music scores in MusicXML format.
It has all necessary musical notations for every styles of musical compositions, like time symbols, music tonality, G and F clefs, etc.
Free Clef is an open source software and can be distributed for free. Developers and musicians can create new features and make it better.