Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
AnthemScore - Convert wav and mp3 to sheet music.
MuseScore.org - Create, play back and print beautiful sheet music with free and easy to use music notation software MuseScore. For Windows, Mac and Linux.
Neuratron AudioScore - Polyphonic Music Recognition Software. Neuratron AudioScore Ultimate music transcription software.
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.
Strum Machine – Backing Tracks - Strum Machine – Backing Tracks app provides features to allow you to create fully customizable backing tracks to practice notes of your favorite song using various instruments such as guitar, mandolin, and standup bass, etc.