Frescobaldi LilyPond Editor
Main author: Wilbert Berendsen
Frescobaldi is a LilyPond sheet music text editor. It aims to be powerful, yet lightweight and easy to use. Frescobaldi is Free Software, freely available under the General Public License.
Frescobaldi is designed to run on all major operating systems (Linux, Mac OS X and MS Windows). It is named after Girolamo Frescobaldi (1583-1643), an Italian composer of keyboard music in the late Renaissance and early Baroque period.
Here is an idea of the basic Frescobaldi workflow:
Frescobaldi is written in Python and uses PyQt for its user interface.
Installation instructions for the program and MIDI support as well as other information can be found in the Wiki. Other requirements and installation instructions may also be found in the INSTALL file.