Open Integration Engine
A free, open-source healthcare integration engine — the community fork of Mirth Connect. Download OIE with or without the MDDS Gateway Plugin.
What Is the Open Integration Engine?
The open-source healthcare integration engine for organizations that need vendor-independent infrastructure.
Why OIE Exists
Mirth Connect was the most widely used open-source healthcare integration engine for over a decade. In 2025, NextGen Healthcare transitioned Mirth Connect to commercial licensing, ending the open-source distribution model that thousands of healthcare organizations relied on. The Open Integration Engine is the community fork that continues open-source development.
Full Mirth Connect Compatibility
OIE maintains full compatibility with existing Mirth Connect channels, code templates, JavaScript transforms, and server configurations. Organizations running Mirth Connect can transition to OIE without modifying their existing interfaces. OIE supports the same standards — HL7 v2, FHIR R4, DICOM, X12, and custom message formats.
Saga IT's Role
Saga IT builds and distributes OIE packages, develops the MDDS Gateway Plugin for remote access and monitoring, and provides professional OIE consulting services including migration planning, channel development, cloud deployment, and managed support.
Choose Your Package
Three download options — all free. Register on MDDS to access installer downloads.
OIE Installer
The Open Integration Engine — a free, open-source fork of Mirth Connect. Available for Linux, Windows, and macOS.
- New integration engine installations
- Replacing Mirth Connect with a free alternative
- On-premise server deployments
MirthSync Plugin
Version control and deployment for Mirth Connect and OIE — pull, push, and sync channels directly from the Administrator.
- Source control for Mirth channels
- Team collaboration on channel development
- CI/CD pipeline integration
Docker Image
Run OIE in a container. Pull and start in seconds — no installer, no dependencies.
- Cloud-native and containerized deployments
- CI/CD pipelines and ephemeral environments
- Quick evaluation without local install
Browser-Based Server Management
Install the MDDS Gateway Plugin on any Mirth Connect or OIE server for remote access, real-time monitoring, and peer-to-peer data exchange.
Modern Admin Console
A completely new browser-based UI for Mirth Connect and OIE. Manage channels, view messages, and configure servers from any device — no Java desktop client required.
Real-Time Monitoring & Alerts
Monitor channel status, message throughput, and error rates from any browser. Configurable alerts notify your team when channels fail or queues back up.
P2P Data Exchange
Exchange HL7 messages, FHIR resources, and files directly with other organizations on the MDDS network. No VPN tunnels or dedicated circuits required.
Moving from Mirth Connect?
OIE is fully compatible with Mirth Connect channels and configurations. Your existing interfaces transfer without modification. For organizations that need professional migration support — including compatibility assessment, parallel-run validation, and zero-downtime cutover — our integration team has deep experience across both platforms.
Common Questions
The Open Integration Engine (OIE) is a free, open-source healthcare integration engine forked from Mirth Connect after NextGen Healthcare transitioned Mirth Connect to commercial licensing. OIE is fully compatible with existing Mirth Connect channels, code templates, and configurations. It is maintained by the open-source community and supported professionally by Saga IT.
Yes. OIE is free and open-source software, licensed under the same open-source terms as the original Mirth Connect codebase. There are no per-server fees, per-message fees, or subscription costs for the integration engine itself. Saga IT offers optional professional support and consulting services for organizations that need expert assistance.
The MDDS Gateway Plugin is a plugin for Mirth Connect and OIE servers that provides three capabilities: secure browser-based remote access (replacing the Java desktop client, no VPN required), real-time monitoring and alerting via MDDS Connect, and peer-to-peer data exchange with other organizations on the MDDS network. The plugin is included pre-installed in the full OIE package or available as a standalone download for existing servers.
Yes. OIE maintains full channel format compatibility with Mirth Connect — your existing channels, code templates, JavaScript transforms, and configuration maps transfer without modification. For professional migration assistance including compatibility testing, parallel-run validation, and zero-downtime cutover, see our OIE consulting services.
Yes. Saga IT provides professional consulting and support for OIE deployments, including migration from Mirth Connect, channel development, cloud-native deployment on AWS and Azure, CI/CD implementation with MirthSync, and 24/7 managed services. Visit our OIE services page for details.
OIE requires JDK 11 or later, runs on Linux, Windows Server, or macOS, and needs a minimum of 4 GB RAM (8 GB recommended) with 2 GB of disk space. The Gateway Plugin requires outbound HTTPS access on port 443 to connect to MDDS Connect. Both Docker images and traditional installers are available.
Need Help with OIE?
Whether you're migrating from Mirth Connect or deploying a new integration engine, our team can help.