Band-in-a-Box - Band-in-a-Box is so easy to use!
Guitar Pro 7 - Create, play and share your tabs
ChordMill - Music play along app for all instruments and voices
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
iReal Pro - iReal Pro – Music Book and Backing Tracks is a commercial music app developed by Technimo for Android and iOS devices.
OpenMPT - OpenMPT is a popular tracker software for Windows.