LMMS - Make music with a free, cross-platform tool
Guitar Pro 7 - Create, play and share your tabs
GarageBand - GarageBand is a fully equipped music creation studio for Mac
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Ableton Live - Ableton makes Push and Live, hardware and software for music production, creation and performance. Ableton´s products are made to inspire creative music-making.
OpenMPT - OpenMPT is a popular tracker software for Windows.