MoodleCloud is a free, cloud-based Learning Management System designed for smaller users with just a few limitations,:
- 50 user maximum
- 200 Mb of disk space (though the database is unlimited for text pages, activities, and posts)
- Core themes and plug-ins only
- One site per phone number (this is how MoodleCloud authenticates the user)
BigBlueButton online conferencing is also available for all users for free. This enables MoodleCloud users to have “online conferencing and video, audio, whiteboards and desktop sharing” (just limited to 6 people).
And, yes, there are some GoogleAds.
Reference and further research: