Since 03.07.2017 the source code of the AusweisApp2 is available on the online platform Github (for software development projects with version management - www.github.com). With the EUPL license, users are able to obtain, duplicate, evolve, program optimizations, and re-distribute them to the community.
The federal government has changed the license of the AusweisApp2, amongst other things to enable the deployment of the eID client for non-officially supported operating systems. Likewise, the use of citizen terminals and the deep integration of the eID function in their own applications are possible now. Appropriate changes from the community can be adopted for official development and incorporated into the from the federation provided, certified AusweisApp2.
Source Code AusweisApp2
The Open Source licence
Learn more about the European Union Public Licence: https://ec.europa.eu/info/european-union-public-licence_en