External Data: Push
These projects make use of OPA APIs to manage and update data in realtime. See External Data: Push Data for more information about this functionality.
Styra Enterprise OPA
It's possible to steam data updates to Enterprise OPA using Kafka. The Kafka integration is documented here.
OPAL
OPAL is able to deliver real-time data updates to OPA instances. See how this works in the OPAL docs.