The main WorkflowHub registry for workflows is available here: https://workflowhub.eu/.
But, did you know that WorkflowHub also operates a development instance? https://dev.workflowhub.eu/
You can use this development instance if you want to test WorkflowHub. For example, before contributing to the registry, or as part of testing integration of your systems with WorkflowHub.
Warning: The development instance may occasionally be wiped!