The project welcomes contributions. JTS is a mature, widely-used library, so contributions will be reviewed carefully to ensure they do not compromise the quality of the codebase.
To start, it helps to announce what you are working on ahead of time to confirm that it is an acceptable contribution. To do this post to the JTS Mailing List.
See CONTRIBUTING.md for more information.
GitHub Repositories
You can use the code from these repositories to experiment, test, build, create patches, issue pull requests, etc.
https://github.com/locationtech/jts - Project repository hosted on GitHub.
Build Technologies
Build Documentation