Budibase

Budibase is an open-source low-code platform designed for building internal tools and automating workflows. It allows users to connect to various data sources, design applications with a drag-and-drop interface, and automate processes with conditional logic and scheduling. The platform supports both cloud and self-hosted deployments, offering features for scalability, security, and collaboration.

Budibase is a strong match for Retool's description as a low-code platform for building internal tools. It explicitly offers API & Database Integrations (connecting to 30+ data sources including SQL, REST APIs, and its own built-in DB), a Drag-and-Drop UI Builder with pre-built components, and Code Customization (JavaScript anywhere in the builder). It also provides robust Access Control & Security features like SSO and RBAC, and Flexible Deployments (self-hosting via Docker/Kubernetes or Budibase Cloud). Additionally, it offers workflow automation, audit logs, mobile responsiveness, and AI features, aligning with many 'other' features.