No code business rules platform for decision logic automation.
OptaPlanner - Mathematical optimization software
DecisionRules.io - Business rule engine that lets you create and deploy business rules, while all your rules run in a secure and scalable cloud. Unlike other rule engines, you can create your first rule in 5 minutes and make 100k decisions in a minute via API.
Ruote - Ruote is a workflow engine written in Ruby. Ruote is not a state machine library.
OpenRules - OpenRules is a Business Rules and Decision Management platform, offering a solution for building, deploying, executing, and monitoring Business Rules and Decision trees.
MiniZinc - MiniZinc is a free and open-source constraint modeling language.
Drools - Drools introduces the Business Logic integration Platform which provides a unified and integrated platform for Rules, Workflow and Event Processing.