MuseScore

MuseScore lets you notate and compose music easily with your keyboard, your mouse or a MIDI keyboard. You can print the beautifully engraved sheet music or save it as PDF or PNG. You can play your score, transpose it, and save it as audio or MIDI file. MuseScore also supports MusicXML to let you share your composition with other scorewriters. MuseScore is free and open source.

What is new in this release:

Version 1.3 fixed crash when loading files with invalid tuplet and improve the stability of the sequencer and user interface interaction.