1) Infinity's Shore -- David Brin
11) Heaven's Reach -- David Brin
Rather inaccurately called the Second Uplift Trilogy, a name which I'd dispute on the basis that the so called First Uplift Trilogy isn't really a trilogy (just three very vaguely linked books).
Anyway, this set is a trilogy, and quite a good one. The trilogy starts off almost in what you might call Fantasy, on Jijo, a planet in which 6 once-galactic species live together. As the trilogy continues it sifts further and further into the slightly skewed
hardSF that catagorised Sundiver and Startide Rising, a variety of hard SF which isn't afraid to laugh at itself, which is refreshing.
Brin does a very good job of portraying his aliens, and his plot has a twist around every corner. The fan of extreme hard-SF will find him insufficiently serious, and the fantasists might be complaining about there being too many