some proposals, ask if you can help, I'm quite sure your help is appreciated:
DASDING - Helping refugees in Stuttgart: http://bit.ly/1VWOyEa
Facebook Group "Refugess - Welcome to Stuttgart: http://bit.ly/1VWOsfS
Flüchtlingsrat Baden-Württemberg - Adressen in Stuttgart: http://bit.ly/1VWOEvv
It's a long list, look for keyword "Freundeskreis", these are essentially volunteer organizations.
Many of the organisations listed here have own homepages, take a look what they need the most.
And keep on supporting Wefugees!