In short: Yes.
We generally allow and welcome active collaboration on our tools.
Of course, we maintain separate GitLab projects for each tool and always implement new features in separate branches. In doing so, we pay attention to uniform quality specifications and optimal test coverage. We are supported in this by SonarQube.
Once the new code has been formally quality-checked and tested, a final content validation of the implementation takes place.
If all parties involved are satisfied with the result, the new feature will be included into the official master and becomes a future component of our tools.
We provide the necessary access to the GitLab on request via our contact form.