What GoRules offers
GoRules writes rules as decision tables, visual flows, or documents. The engine runs in-process with no network hop, with SDKs for several languages and an MCP server for AI agents.
Alternatives / Drools
1 open-source alternative
1 Best Open Source Drools Alternatives in 2026
Looking for an open source Drools alternative? Only one project we verified fits: GoRules, whose core ZEN engine is MIT. The hosted management platform is a paid product.
Written by Maxime DERAME
Last updated:
Best Drools alternatives at a glance
| Alternative | Best for | License |
|---|---|---|
| GoRules | Rules engine with decision tables | MIT (ZEN engine) |
How we chose these Drools alternatives
We looked for open-source business rules engines. We verified GoRules' license, recent activity, stars, and SDKs in its repository. See our methodology for the full criteria.
Important: open-source scope
The ZEN engine is open source, while the management features such as scenario testing, approvals, rollback, and audit trail are part of the paid platform. Its SOC 2 claim is the vendor's.
License details
The GoRules ZEN engine is MIT.
Maintenance status
GoRules had commits within days of this update.
Why look for a Drools alternative?
Drools is itself open source, but teams look for lighter engines outside the Java and Red Hat ecosystem. A rules engine lets business logic change without redeploying the application.
gorules.io
GoRules provides a business rules engine whose core ZEN engine is MIT. Rules are written as decision tables, visual flows, or documents, and the engine runs in-process with SDKs for several languages and an MCP server. The hosted business rules management system is a paid product.
2.1K225MIT (ZEN engine)Self-hosted
Pricing: Free engine; the hosted management platform is paid.
- In-process engine, no network hop
- Decision tables and visual flows
- Many language SDKs
- Management UI is in the paid product
- Smaller ecosystem than Drools
Compare Drools alternatives
| Alternative | Type | License | Self-hosted | Best for |
|---|---|---|---|---|
| GoRules | Rules engine | MIT (ZEN engine) | Embedded | Business rules |
Which one should you choose?
Want decision tables evaluated in-process
GoRules runs the ZEN engine with SDKs for several languages.