I've for a good while been using an excellent port of Scala's persistent data structures in my Kotlin code known as Dexx. This also works well from Java code.

However, while the project is what I would call feature complete, it's no longer maintained, resulting in outdated dependencies. It would also become problematic should any bugs or issues pop up.

Hence I decided to fork it as Sigbla PDS and tidy it up a bit, with v1.0 now released and ready for use.