What are some alternatives?
When comparing VFront and Oppia, you can also consider the following products
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Infogalactic - The planetary knowledge core
Microsoft Office Access - Access is now much more than a way to create desktop databases. It’s an easy-to-use tool for quickly creating browser-based database applications.
Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
nuBuilder Forte - Low-code, open-source RAD development tool for creating web-based database applications.
Moodle - Moodle - Open-source learning platform | Moodle.org