NocoDB

NocoDB is an open-source no-code database platform that transforms relational databases into a smart spreadsheet interface. It allows users to build custom applications with various data views, integrate with external databases and APIs, and automate workflows. The platform emphasizes data ownership, scalability, and community-driven development.

NocoDB is a strong match for Retool's features. It explicitly states its ability to connect to various databases (Postgres/MySQL) and expose data via APIs, fulfilling the 'API & Database Integrations' and 'Code Customization' (through API access) requirements. The platform offers a 'spreadsheet interface' and 'versatile views' like Grid, Kanban, Gallery, and Form, which align with a 'Drag-and-Drop UI Builder' concept for building applications. While not explicitly 'drag-and-drop' in the same sense as Retool's component library, the visual interface for building database solutions serves a similar purpose. 'Access Control & Security' is mentioned through 'Access Control with Roles' and 'fine-grained Access Control'. 'Flexible Deployments' is supported by its open-source nature and mention of 'On Premise' and 'Air Gapped' deployments for enterprise. 'Workflow Automation' is covered by its 'App Store for Workflow Automations' and 'Web-hooks'. 'Mobile-Responsive Support' is indicated by 'Effortlessly view and edit your data anytime, anywhere, from your smartphone with our responsive view'. 'Prebuilt React Components' is implied by the various 'views' and 'field types' it offers, which are essentially pre-built UI elements. 'Partner & Customer Portals' is supported by the ability to 'Share Bases / Views: either Public or Private (with Password Protected)'.