Not exactly what you're looking for, but Splitgraph [3] has some solid datasets you can mess with.
Also, seekwell [0] might be able to fill that void depending on your use case and we're rapidly making improvements. So far we have highly customizable Forms [1] and editable tables [2] which you can add to a dashboard and expose to non-technical people on your team. We have a company with over 100 people in sales and operations using this daily. Supports Postgres, MySQL, Snowflake and SQL Server.