* Extensively tested and production-ready, trusted by many blue chip businesses
# Licensing
Mongoose is released under commercial and [GNU GPL v.2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html) open source licenses.
Commercial Projects:
Once your project becomes commercialised GPLv2 licensing dictates that you need to either open your source fully or purchase a commercial license. Cesanta offer full, royalty-free commercial licenses without any GPL restrictions. If your needs require a custom license, we’d be happy to work on a solution with you. [Contact us for pricing.](https://www.cesanta.com/contact)
Prototyping:
While your project is still in prototyping stage and not for sale, you can use Mongoose’s open source code without license restrictions.
-[Frozen](https://github.com/cesanta/frozen) - JSON parser and generator
-[SLRE](https://github.com/cesanta/slre) - Super Light Regular Expression
library
People who have agreed to the [Cesanta CLA](https://docs.cesanta.com/contributors_la.shtml) can make contributions. Note that the CLA isn't a copyright assigment but rather a copyright license. You retain the copyright on your contributions.