Quark is similar to sour cream. You can make your own using purchased buttermilk.
Labneh is a Middle Eastern Yogurt Cheese. This is easy to make at home with store-purchased yogurt. Labneh is served with a good quality olive oil and Zaatar herb mixture
From Chevre Feuille - The site also contains information about soap making at home. Use in place of any recipe that calls for Fromage Blanc.
Labna is a cheese made from yogurt and has been made and consumed since Egyptian times.