LMS Discussions Tool
(OIT enterprise supported)
Both Sakai and Canvas offer Discussion tools where instructors can create an unlimited number of topics for student interaction, and which can be graded.
(OIT best effort support only; see vendor's support site first)
An online forum for asking and answering questions on the course. Anonymous posts can be configured. 3rd party free tool that has switched to a paid model and will no longer be licensed by Notre Dame as of June 30, 2021. Here are our suggestions for replacing Piazza.