Top 3 Java constraint-programming Projects

Choco

4 668 8.5 Java

An open-source Java library for Constraint Programming
timefold-quickstarts

2 148 6.9 Java

Get started with Timefold quickstarts here. Timefold is the successor of OptaPlanner, by the OptaPlanner team. Optimize the vehicle routing problem, employee rostering, task assignment, maintenance scheduling and other planning problems

Project mention: Planner programming blows my mind | news.ycombinator.com | 2024-02-20

https://github.com/TimefoldAI/timefold-quickstarts
As for the Community/Enterprise split - we want to continue the open source project, but we need to eat too :)
Geoffrey

InfluxDB

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
OptaPlanner

30 133 8.0 Java

Java Constraint Solver to solve vehicle routing, employee rostering, task assignment, maintenance scheduling, conference scheduling and other planning problems.

Project mention: OptaPlanner VS timefold-solver - a user suggested alternative | libhunt.com/r/optaplanner | 2023-06-23

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).