REI3

REI3 is an open-source low-code platform for building and running multi-user business applications. It addresses requirements typically handled with spreadsheets, shared mailboxes and similar workarounds, letting users create data stores, forms, workflows, access controls, API calls and scheduled notifications through a graphical builder. Applications can be self-hosted on-premise or in the cloud, and existing REI3 applications cover areas such as time tracking, request handling, password sharing, projects, assets and work time.

The Builder provides a graphical environment for defining forms, lists, calendars, Gantt plans, Kanban boards and charts, along with backend and frontend functions, email processing, schedulers, access policies and end-to-end encryption. REI3 supports REST endpoints for event-driven or scheduled data exchange, LDAP and Active Directory directory services, CSV import and export, an ICS connector, PDF generation, full-text search, file management with versioning, barcode scanning and PWA installation. Applications can be exported and transferred between REI3 instances, and additional nodes can be added to scale a server cluster.

REI3 is intended for organizations and individuals building internal or commercial applications, as well as those deploying existing REI3 apps. The platform is free to use for private or commercial purposes, with most available applications offered at no charge; enterprise features, support and services are available separately.