Higson.io - Hyperon is a BRMS, that was created with very large decisions and hyper-performance in mind. It stands out with the concept of the business domain which organizes the whole configuration in easy to manage way.

ILOG JRules - ILOG JRules is a business management system to allow developers and businesses to easily build and deploy a rule-based application that automates variable and fine-grained decisions.

Decisimo - Decisimo - decision intelligence services and decisioning system. An engine for deployment of rule based and machine learning driven decisioning

Corticon - Progress Corticon Business Rules Engine helps organizations of all kinds make faster decisions by managing the rules that drive business processes.

GoRules.io - Open-source business rules engine for automating decisions

SAS Business Rules Manager - Discover how SAS Business Rules Manager lets you create, deploy and manage business rules from one place.