This site allows you to meta-search images for course design pages. In putting together Canvas or Google Classroom pages having resources for non-proprietary digital images is a huge help.
Flat is a full-featured online music notation tool. The product has commercial and educational versions. The educational version has teacher administrative controls and allows an educator to integrate Flat into common learning management services including Google Classroom and Canvas. Students and teachers can collaborate on the same notation projects, and have the ability to integrate and link to external content (e.g. YouTube). Flat also has a plugin for Google Documents which allows users to create and embed short selections of music notation into their work.
This website is a music writing software that can be used online as well as offline. The layout of the program is simple to navigate and grasp. Students can easily learn how to arrange or create compositions here. Collaboration on projects is simple. Projects can be shared with one another. There is also a feature in which a teacher can leave written notes within the scores themselves.
FLAT is essentially Google's attempt at notation software. Thus, it is extremely intuitive. Though more limited than other programs, it essentially does everything a student composer would need. Students can sign up for an account with a Gmail address and can easily share their scores with each other and their teacher.
Music notation softwares like Finale and Sibelius are quite costly for students to purchase and use. Flat.io is a free online music notation software that allows you to notate music online, and share it with your friends in the cloud. It is collaborative in a way that people get to comment on your music, and you also get to comment on other people's compositions. All you need is to sign up with either google, facebook, or with your email address. It is a good resource for teachers to set notation assignments, and while students do the assignments, they learn many concepts in music such as tempo, speed, dynamics, phrasing, structure, to mention but a few.
A site with free digital resources for building online course content. Adding links to pages for students is a good first step, but making it visually stunning has been a challenge for me. These free resources allows to spice up the visual layout of course pages.