The ability to add unlimited guest users to an infinite canvas makes this a splendid alternative as remote teaching kicks in again. The fact that you can videos, photos, and PDF files to the board puts it over the top. It is also possible to draw the users attention to a specific part of the board, as a teacher I find this incredibly useful especially as the canvas gets really big. The ability to lock a specific portion is another added advantage.
Beyond the classroom, there are may possibilities I see with the numerous inbuilt templates SWOT analyses, Brand Circles, Customer Personas and Golden Circle diagrams, planning maps, kanban boards.
It is a good alternative to Mural and definitely 10x better than Jamboard, two other apps I used before Collaboard came along. Review collected by and hosted on G2.com.