OptaPlanner

OptaPlanner stopped active development in 2023.
But it continues open source as Timefold Solver: solver.timefold.ai

The old website is now hosted here to help legacy users:
optaplanner.io

See the history for more information:
optaplanner.io/the-history-of…

OptaPlanner is the most popular open source Constraint Solver in Maven Central (the 98 TerraByte Java and Kotlin repository) according to MvnRepository:
mvnrepository.com/open-source/co…

Feedback from a user about CS:
"I had to convert around 30 rules written in DRL to ConstraintStreams. After struggling at the beginning I started to like it more and more. At the end I really liked it. Thanks a lot for this awesome work!"
Migration guide: optaplanner.org/download/upgra…

New blog: introducing the OptaPlanner Operator for Kubernetes-OpenShift
optaplanner.org/blog/2022/06/0…

An interesting article on how to optimize scheduling tasks of different durations and requiring different skills with #OptaPlanner:
devapo.io/blog/optaplann…