The Xfce team has launched the Xfce Foundation e.V. as a non-profit steering organisation for the project in Germany:
We will soon announce more details about the decisions that were made and about how you can become an Xfce Foundation member (it’s really not difficult and it won’t cost you any money — but there are obligations connected to it of course). After the registration we will create a bank account and a new paypal account as well in order to collect donations. These donations will be tax deductible!