I have seen several advertisements on various websites soliciting assistance with filing US taxes from Germany. I have just completed my US tax return form via TurboTax at the following URL:
You cannot use the free version of TurboTax in order to file taxes on income earned outside the United States. I paid around $40 to use the upgraded TurboTax version that allows you to do international taxes. It is very simple and straight forward. In essence you pay $40 to show to the US government that you don't owe any taxes (if you lived outside the US more than Protected content . It is also important to note that you cannot e-file your international tax forms. You have to print physical copies and mail them to the IRS service center. I would highly suggest this as an alternative. PM me with any questions.