There are 4 books in the Ringworld series. The newest book is Ringworld's Children which came out in 2004.

1
Ringworld

Book cover of Ringworld
Pierson's puppeteers, strange, three-legged, two-headed aliens, have discovered an immense structure in a hitherto unexplored part of the universe. Frightened of meeting the builders of such a structure, the puppeteers set about assembling a team consisting of two humans, a puppeteer and a kzin, an alien not unlike an eight-foot-tall,…

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2
The Ringworld Engineers

The Ringworld Engineers

Ringworld: the most stunning artifact in known space, an articficial world with three million times Earth's surface area. Who built it? And where are they?

In this stunning sequel to Larry Niven's Hugo and Nebula award-winning novel, Louis Wu (now a near-hopeless lirehead hooked on electrical ecstasy), the aged Kzin…

3
Ringworld Throne

Ringworld Throne
Come back to the Ringworld . . . the most astonishing feat of engineering ever encountered.  A place of untold technological wonders, home to a myriad humanoid races, and world of some of the most beloved science fiction stories ever written!                    

The human, Louis Wu; the puppeteer known as the…

4
Ringworld's Children

Book cover of Ringworld's Children

The Ringworld is dying.

And this time even Louis Wu - captive of the hyper-intelligent alien Tunesmith - may be unable to save it. Even if Louis can escape he will then have to survive in a galaxy ravaged by interstellar war and deadly political intrigue. For the Ringworld is…