You can add almost anything to your OPAC because it's also a website! Watch John add a bunch of potlets (or widgets) to an OPAC.
Media Flex provides multiple ways to curate resources for your school. Choosing which one works best for what you want to do is the first task.
Three of the easiest tools are:
Embed curations from other tools with the html portlet. See the Tappan Zee HS example below.
Topic Walls and Library Resource Showcases can be embedded on other web pages too. Click on the share icon on the top right side of the portlet for the code.
Add news from specific news sites, etc. or add a widget like one of TeachinBook's reading promotion widgets with the html portlet.