Kotlin is an open-source project under the Apache 2.0 License. The source code, tooling, documentation, and even this web site are maintained on GitHub. While Kotlin is mostly developed by JetBrains, there are hundreds of external contributors to the Kotlin project and we are always on the lookout for more people to help us.
Participate in Early Access Preview
You can help us improve Kotlin by participating in Kotlin Early Access Preview (EAP) and providing us with your valuable feedback.
For every release, Kotlin ships a few preview builds where you can try out the latest features before they go to production. You can report any bugs you find to our issue tracker YouTrack and we will try to fix them before a final release. This way, you can get bug fixes earlier than the standard Kotlin release cycle.
Contribute to the compiler, standard library, and tooling
You can help us by completing open tasks. Please keep an open line of communication with us because we may have questions and comments on your changes. Otherwise, we won't be able to incorporate your contributions.
Contribute to other libraries and create your own
Besides the standard library that provides core capabilities, Kotlin has a number of additional (kotlinx) libraries that extend its functionality. Each kotlinx library is developed in a separate repository, has its own versioning and release cycle.
If you have a library that could be useful to other Kotlin developers, let us know via firstname.lastname@example.org.
Contribute to the documentation
Please keep an open line of communication with us because we may have questions and comments on your changes. Otherwise, we won't be able to incorporate your contributions.
Create tutorials or videos
If you've created tutorials or videos for Kotlin, please share them with us via email@example.com.
Translate documentation to other languages
You are welcome to translate the Kotlin documentation into your own language and publish the translation on your website. However, we won't be able to host your translation in the main repository and publish it on kotlinlang.org.
This site is the official documentation for the language, and we ensure that all the information here is correct and up to date. Unfortunately, we won't be able to review documentation in other languages.