I see windmill mentioned a few times (founder here). I think we are both anchoring our tools around "Retool for enterprise" because Retool is known and it give a quick overview of the domain we are in: Internal tools, but the audience and pain solved by refine and windmill are likely to be quite different.
Windmill caters towards software engineers that want to write powerful backend logic in typescript/python/bash/go, long running jobs and complex workflows for internal use (we compete there with temporal, airflow, airplane), and share them with the rest of their orgs with all permissions handled for them, ability to scale on large clusters, and observability baked in (full history of all executions, including args, logs, and result) AND in addition have a low-code dashboard builder similar to retool because webhooks, schedules and automatically generated UI from scripts are not always sufficient.
Refine looks more like a headless retool for software engineers that are comfortable with frontend frameworks but want an opinionated stack that is tailored toward internal uses and do not want to deal with the rest of the boilerplate, user management, and connection/management of databases etc. I could see myself preferring refine for some use-cases and would probably recommend it if you are comfortable with writing frontend and the logic is limited to CRUD. So I wish them good luck and I am happy to see such diversity in the open-source space!