Open Source
Axon products have different licenses and accept different kind of contributions
Apache 2 Open Source License
The Java framework for developers who want to implement their apps follows architectural principles such as DDD, CQRS, and Event Sourcing. The framework integrates with Spring-Framework but also allows to write plain Java apps. The repository is public, and the community can contribute by reporting bugs, proposing new features, plugins, etc.
Quick Summary
You can do what you like with the software, as long as you include the required notices.
Can
Ability to use, copy / reproduce the work freely in unlimited quantities
Ability to make use of the work for commercial purpose or to license it for a fee
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Ability to distribute the work to third parties freely, in unlimited quantities
Ability to modify / combine the work with others and create derivatives
Ability to license the work, including possible modifications (without changing the licence if it is copyleft or share alike)
Cannot
Describes the right to charge the software owner or contributors for direct or indirect damages.
Describes the rigth to use the original licensor or contributors' names, trademarks or logos (i.e. for advertisement, promotion)
Must
Describes whether the original copyright and attribution marks must be retained
Include the full text of the licence in the modified software.
The source code of distributed derivatives must be publicly available
