Add the section: Constraint Satisfaction Problem (CSP) Solver

Author: alessandroleite

README.md

@@ -9,6 +9,7 @@ A curated list of awesome Java frameworks, libraries and software. Inspired by o
     - [Code Analysis](#code-analysis)
     - [Compiler-compiler](#compiler-compiler)
     - [Configuration](#configuration)
+    - [Constraint Satisfaction Problem (CSP) Solver](#constraint-satisfaction-problem-csp-solver)
     - [Continuous Integration](#continuous-integration)
     - [Database](#database)
     - [Data structures](#data-structures)
@@ -100,6 +101,13 @@ A curated list of awesome Java frameworks, libraries and software. Inspired by o
 
 * [config](https://github.com/typesafehub/config) - Configuration library for JVM languages.
 
+## Constraint Satisfaction Problem (CSP) Solver
+
+* [Choco](http://choco-solver.org/) - An off-the-shelf constraint satisfaction problem solver, which uses constraint programming techniques to solve constraint satisfaction problems (CSP).
+* [JaCoP](https://github.com/radsz/jacop/) - A constraint programming solver that includes an interface for the [FlatZinc language](https://www.minizinc.org/downloads/doc-1.6/flatzinc-spec.pdf), enabling it to execute [MiniZinc](http://www.minizinc.org/) models.
+* [OptaPlanner](http://www.optaplanner.org/) - A business planning and resource scheduling optimization solver.
+* [Sat4J](http://www.sat4j.org/) - A state-of-the-art SAT solver for boolean and optimization problems in Java.
+
 ## Continuous Integration
 
 *Tools which support continuously building, testing and releasing applications.*