We welcome contributions. To start, it helps the community if you can let us know what you are working on ahead of time.
Our developer list is hosted at LocationTech here: https://locationtech.org/mailman/listinfo/jts-dev.
JTS is an open source project under a EPL 1.0 and BSD style License. In order to accept code contributions, the submitter must
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Sign a CLA with the Eclipse Foundation and use the registered email with the Git commits associated to the GitHub pull request.
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Acknowledge that the code contribution is IP clean by 'signing off' the commits in the pull request with the '-s' option to 'git commit'.
If you have questions or concerns about this, please ask on the jts-dev list.