NyARToolkit project is developing a vision-based Augmented reality library that based on ARToolKit.
Major products are ARToolKit compatible library that run on managed environment, such as Java / C #. In addition, the development environments of Unity or Processing package are published.

Current NyARToolkit libraries has the old ARToolKit 2.x-based APIs and part of ARToolKit Professional(ARToolKit5) APIs.
Those softwares are be available at LGPLv3 . Some utilities are be available at the MIT license.