Appsmith

Appsmith is an open-source low-code tool for making admin panels, dashboards and internal apps. You drag widgets onto a canvas, connect databases and APIs, and add JavaScript where needed.

Self-hosting is popular because teams keep control of their data. Recent versions include AI help for generating queries and building pages from descriptions.

It is a practical choice for developers who find spreadsheets too limiting but do not want to build a full admin app from scratch.