Gammu and Wammu are translated to several languages, but the translations are far from being perfect.
The contribution is easy and documented on translating page. Translating brings you great opportunity to contribute to free software without programming skills, so if you know some language, feel free to start as soon as possible! New Wammu release is getting closer and it will include your work.
Gammu and Wammu are looking for maintainer of Windows build. You have great opportunity to help this project.
As you might have noticed, Gammu 1.26.91 has been released without Windows binaries for Python bindings. The reason is simple - my cross compilation setup broke again and I don't have time to fix it. Cross building Python extensions was always tricky, but it is getting harder and harder with each Python version - it requires newer MSVC support libraries to link with and it introduces various complications.
Doing that natively on Windows, should not be that hard. You need to have Visual Studio and you need some experiences with building things for Windows. If you want to help, just contact us on mailing list.
Roadmap for Gammu and Wammu has been just published. Right now it contains just basic information about next releases, but in future it is expected to include more details about next few releases. It will allow users and application developers to be prepared for some changes longer in advance. Also if you are interested in helping with some listed feature, you are welcome to help!