Context for Instructors
This is particularly important for history classes as there is practically an infinite amount of knowledge available for students to examine and post as part of their Scalar projects. I have made great use of local archives in my classes, all of whom are grateful to have undergraduates interested in posting their materials on the Internet for them and to not have to pay for hosting themselves in the bargain
There are certainly other tools available for digital projects, but Scalar is simple enough that students can learn its basics over the course of a few weeks and spend the rest of their semesters learning the history they need to complete their projects.