I used Noteflight in my classroom as an integrated program to our LMS. This is a simple platform for notation that allows sharing of scores with students as well as the ability to build and work with templates for various exercises.
This is a very useful program for both on campus and online programs.
It is a simple platform and easy to learn and use. Noteflight is not as robust as other programs but meets all basic needs of notation in a Music Theory classroom. The immediate sharing and integration into a LMS is seamless.