Saute sausages in heavy large skillet over medium-high heat until cooked through, crumbling coarsely with back of spoon, about 10 minutes. Using slotted spoon, transfer sausage to large bowl. Pour off any drippings from skillet. Melt butter in same skillet over medium-high heat. Add leeks, apples, celery, and poultry seasoning to skillet; saute until leeks soften, about 8 minutes. Mix in dried cranberries and rosemary. Add mixture to sausage, then mix in bread and parsley. Season stuffing to taste with salt and pepper. (Can be prepared 1 day ahead. Cover and refrigerate.) Mix eggs into stuffing.