1) After Mustang
2 integrating the validator two weeks ago I released a first
bugfix release, Mustang
There is a new Factur-X sample created in a test as well as some Xrechnung output created in another test
In general, I suggest a teamchat on Factur-X for quick questions, and topics of mutual interest, the according invitation link expires in four days, i.e. November 26.
3) List of providers
The AWV apparently replaces it (german) list of 358 ZUGFeRD-"Supporters" (provider and users) with a list of currently 42 ZUGFeRD-providers. Open-Source-wise I miss e.g. Konik as library and maybe Odoo, OpenZ and Hibiscus as software, as well as the @GP factur-x PHP library and Akretion's factur-x python library.
Who as far as I understand would have to use a german form on a german page to apply.
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