NtEd - Music Score Notation editor.
uberflip - Organize and Centralize ALL of your Content in minutes
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Paperflite - Paperflite is a prospect engagement platform to enable business development reps to see what sells.
DaCapo Editor - DaCapo Editor is a free Open Source music sheet editor which allows to easily create nice looking partitions. It is available as a web application as well as a desktop application for Windows, MacOS and Linux.
SnapApp - SnapApp is an interactive content creation platform.