REI3

REI3 is an open-source low-code platform for building, running, and maintaining multi-user business applications. It combines app modeling (data, forms, logic) with operational features such as access control, automation, and integrations, designed for self-hosted deployments.

Key Features

• Visual app building for data stores, forms, and business logic
• Workflow capabilities such as state-based forms, notifications, and scheduled actions
• Role-based access control and access policies (including record-level restrictions)
• End-to-end encryption support with integrated key management
• Integrations via REST endpoints, CSV import/export, and ICS calendar feeds
• Full-text search across application data
• Mobile-friendly UI with PWA support and mobile-specific settings
• Security features including password policies, brute-force protection, and MFA

Use Cases

• Replacing spreadsheet-based processes with structured internal tools
• Building internal apps for time tracking, asset management, requests, or ticketing
• Creating secure apps for sensitive data such as password sharing

Limitations and Considerations

• Requires a PostgreSQL database and operational planning for backups and upgrades
• Some advanced features (for example clustering) may add deployment complexity

REI3 fits organizations that want fast application delivery without giving up data ownership and customization. It is especially useful for internal business software where access control, workflows, and integrations are essential.