What are some alternatives?
When comparing Frescobaldi and MuseScore, you can also consider the following products
Rosegarden - Rosegarden is a powerful audio, MIDI and score editing and sequencing environment for musicians.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Guitar Pro 7 - Create, play and share your tabs
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.
TuxGuitar - A Multitrack tablature editor and player.
LilyPond - GNU LilyPond is a computer program for music engraving.