MuseScore

MuseScore is a free and open-source music composition and notation software that allows users to create, edit, and share musical scores. Designed for musicians of all levels, it offers a user-friendly interface combined with powerful features for professional music notation. You can input music using a MIDI keyboard or by directly entering notes on a virtual staff.

1. Free Software: Completely free with no limitations.
2. Open Source: Developed by a community of contributors.
3. Professional Notation: High-quality music notation capabilities.
4. MIDI Input: Supports input via MIDI keyboards.
5. Various Formats: Import and export MusicXML, MIDI, and more.
6. Extensive Instrument Support: Write music for piano, guitar, orchestra, choir, and more.
7. Soundfonts: Use custom soundfonts for unique sounds.
8. Plugins: Extend functionality with various plugins.