That last plant is a Peace Lily,
Peace Lilies (Spathiphyllum). They prefer moist soil on the dry side and bright indirect light - if that's a South facing window it may be getting too much sun. It also looks like you may be watering it too much. If it's been in that pot a very long time, say over a couple of years, I'd cut it back and repot it into fresh soil and let it start over again.