Node-rules is a light weight forward chaining rule engine that can be used in JavaScript and TypeScript based projects.

Rule engine/process engine, committed to solving flexible and complex hard-coded problems, for complex/flexibly changing business, provide a new abstract orchestration solution that is lightweight, high-performance and provides visual operation pages. Java规则引擎-ice，针对复杂/灵活变动业务，提供一个新的抽象编排解决方案，轻量级，高性能并提供可视化操作页面

Visual DSL framework for django

A text/template based rules engine

Create an executable project (API and Admin App) from a database or natural language prompt with 1 command, customize with declarative rules and Python in your IDE, containerize and deploy.

Business Rule Engine on PHP

OpenBRMS is a cloud native business rules management system with scripted rules

Business Rules Integration Engine

JSON-based Business Rules Engine

Integration code to execute at scale business rules in Apache Spark

YAML Descision Notation (YDN). Notatie van business rules in YAML formaat.

Welcome to an open-source transaction monitoring engine! This product is designed to simplify the definition and management of business rules while also offering a scalable infrastructure for rule execution and backtesting.

Sample showing how to use IBM ODM in Message-driven Architecture with Kafka

How to make a simple rule engine in PHP

A business rule engine written in Python.

Simple, clean, and object-oriented way to create and execute business rules in .NET

Simple node app that wraps the json-rules-engine library to allow you to externally run and execute business rules.

Java Business Rule Engine