NocoDB

NocoDB is a no-code platform that puts a spreadsheet grid, Kanban board, calendar, and form in front of a database, connecting either to its own storage or to an existing PostgreSQL or MySQL instance. Views, formulas, lookups, roles, and permissions let non-technical teammates work with the same records the application uses, and REST APIs and webhooks expose that data to other tools.

Teams use it for internal tools, content and inventory tracking, and quick prototypes without building a dedicated admin panel.

Self-hosting it means both the interface and the data sit on infrastructure you control, and there is no per-user licence charged for everyone you invite to collaborate.