Budibase

Budibase is an open-source low-code platform for building internal business apps quickly. It comes with a built-in CouchDB database or lets you connect to external sources like PostgreSQL, MySQL, or REST APIs. The visual builder lets you drag components onto a canvas, bind data, and add basic logic without writing much code.

It works well for teams needing quick internal tools or dashboards who don't want to commit to expensive SaaS platforms. Compared to Appian or Mendix, Budibase is lighter weight and self-hosted, making it better for smaller teams or organizations wanting to avoid vendor lock-in.