Maltitol is a sugar alcohol, a sweetener. Safe, although consumption of over 100 g/day (hundred grams!) can have laxative effect.
Inulin is much more interesting. It is also a sweetener, albeit much less potent (up to 10% of sweetness of sugar). It is found in "good for you" foods, such as garlic and leek. It is safe for diabetics and stimulates the growth of good bacteria in the intestine (i.e. considered to be a prebiotic); it could be beneficial in managing the cholesterol and sugar blood levels. Negative effect are the possible gassiness, and in people with fructose malabsorbtion could, again, have laxative effect, if taken in excessive quantities. Do check out the article, it has more interesting information, especially if you are into chemistry.