Place eggplant and zucchini in a colander, sprinkle with salt and let drain in the sink for about 30 minutes.
In a large dutch oven, cook sausage over medium heat until no longer visibly pink; drain.
Remove and cut into 1/2-inch slices. In same pan, fry the slices until all pieces are golden brown. Remove from pan and set aside.
Pat the eggplant dry with a paper towel.
In same Dutch oven used for frying sausage, add another tablespoon of olive oil, and heat over medium-high heat
Add the eggplant, reduce to medium heat, and cook 3-4 minutes or until beginning to soften and are lightly browned. Transfer to a bowl.
Refresh oil as needed. Add zucchini and yellow squash and cook 3-4 minutes or until beginning to soften and are lightly browned. Transfer to the bowl with the eggplant.
Refresh oil if needed. Add the onion and cook 4-5 minutes or until the onions begin to soften, adjusting the heat as necessary so the onions don't burn. Add minced garlic and sauté a minute or two longer.
Add the red bell peppers and continue cooking another 3-4 minutes or until beginning to soften.
Add chopped tomatoes and cook 1-2 minutes.
Add wine, bring to a boil, and cook 1-2 minutes.
Add crushed tomatoes, sugar, and Herbes de Provence.
Return eggplant, zucchini, and yellow squash to the pot, reduce heat to medium-low and simmer covered 25-30 minutes or until vegetables are tender.
Season with salt and pepper to taste.
Serve with minced fresh basil and/or minced fresh parsley.