What about for the other languages and have I missed anything for German? (like is there a captial ß ?) thanks.
The ß is pretty much the same as 'ss', and to my knowledge there are no words starting with it -- lowercase only.
Dutch:
Aa-Zz € éëèï
The special characters are Lowercase only, there are no words that start with these characters. In Dutch they are pretty much only used to declare the intonation when you use more than two vowels in a row. They're not that common, and most keyboards don't have special keys dedicated to them.
Finally -- I don't know what you want to use this for, but something to keep in mind: Even though the language itself doesn't use a bunch of the other 'special' characters, you can still come across things like ü or ö inside people's names, especially among people of Turkish descent