The best open source alternative to Drools is GoRules. If that doesn't suit you, our users have ranked more than 10 alternatives to Drools and seven of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Drools are OptaPlanner, Joget Workflow, Evrete and MiniZinc.
Gorules.io is a flexible and intuitive rules engine that helps organizations automate decision-making processes. Its drag-and-drop interface and powerful rule engine make it easy for non-technical users to create and manage complex business rules.
OptaPlanner is a constraint satisfaction solver. It optimizes business resource planning. Every organization faces scheduling puzzles: assign a limited set of constrained resources (employees, assets, time and money) to provide products or services to customers.
Joget Workflow is an open source web-based workflow software to develop workflow and Business Process Management applications. More than just a workflow or BPM platform, Joget offers full-fledged agile development capabilities (consisting of processes, forms, lists, CRUD and...
Business Rule Management System (BRMS) A 5 star mature open-source DotNet based Business Rule Engine (BRE)
DotNet simple BRMS XML rule engine Open source. Does most of what's needed from a top down rule system Fast and simple to implement and run.
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