There are 6 books in the The Uplift Saga series. The newest book is Heaven's Reach which came out in 1998.

1
Sundiver

Book cover of Sundiver
In all the universe, no species reached for the stars without “uplift” guidance, except possibly humankind. Did some cryptic patron race begin the job long ago, then abandon us? Or did we leap all by ourselves? That question burns, yet a greater mystery looms ahead, in the furnace of a…
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2
Startide Rising

Startide Rising
After crash-landing on an uncharted planet, the human and dolphin crew of a spaceship from Earth battle fleets of alien warships

4
Brightness Reef

Brightness Reef
In the centuries after the planet Jijo is abandoned for the sake of restoring ecological balance, six different species secretly colonize the planet and live in ongoing fear of being discovered and punished by the Five Galaxy patrollers

5
Infinity's Shore

Book cover of Infinity's Shore
The second book in David Brin's second Uplift trilogy is a magnificent addition to one of science fiction's most ambitious and compelling series. The six races had been living in exile on the planet Jijo for two thousand years before they were discovered by the Five Galaxies. Now they are…

6
Heaven's Reach

Heaven's Reach
In Brightness Reef and Infinity's Shore, David Brin boldly returned to the Uplift universe he so brilliantly invented in the Nebula and Hugo award-winning trilogy Sundiver, Startide Rising, and The Uplift War.  Now he concludes this second trilogy with his most imaginative and emotionally powerful novel to date--the shattering epic…