For OER delivered as web pages, ‘static website generators’ such as Jekyll build websites from source code and may provide “everything you need to create, manage, and publish” OER (Williamson, 2018a).
Combined with a version control system this OER source code may be openly shared and adapted, not hiding in a database.
GitHub Pages is a free web-based version control system with Jekyll built in that provides an easy place to start (Williamson, 2018b).