It also let’s you store the letter in a proprietary format for later editing, as well as exporting it to PDF or Latex format.

Although it’s an early alpha version, it’s quite usable with one major drawback: it’s only available in German so far, because the Latex-template used doen’t support other languages. I hope this will change in the near future and it supports at least English as additional language.

For more information visit the project’s page.