Directus provides a set of tools for any SQL database: REST API, GraphQL, authentication and access control, file transformations. You can also use Directus as a headless CMS or even create internal tools using its frontend capabilities.
Supabase a set of tools, which provides user authentications and Row-Level security, data storage, REST API, edge functions and much more
Appsmith offers a range of building blocks like widgets, APIs and Queries to speed up the development process
Metabase allows users to build dashboards and get answers to their own questions about data