JDrupes (with domain jdrupes.org) is used as an umbrella for various Java projects that don’t have a domain of their own for the sources.
A javadoc doclet that handles Markdown comments.
A non-blocking HTTP codec without any dependencies.
A Kubernetes operator for running virtual machines (notably Qemu VMs) as pods.
A Keycloak extension that uses a Moodle instance for authentication (and registration).