41 titles- Inherit the Stars (New York: Ballantine Books/Del Rey, 1977)
- The Genesis Machine (New York: Ballantine Books/Del Rey, 1978)
- The Gentle Giants of Ganymede (New York: Ballantine Books/Del Rey, 1978)
- The Two Faces of Tomorrow (New York: Ballantine Books/Del Rey, 1979)
- Thrice Upon a Time (New York: Ballantine Books/Del Rey, 1980)
- Giants' Star (New York: Ballantine Books/Del Rey, 1981)
- The Minervan Experiment (Garden City, New York: Nelson Doubleday, 1981)
- Voyage from Yesteryear (Garden City, New York: Nelson Doubleday, 1982)
- Code of the Lifemaker (New York: Ballantine Books/Del Rey, 1983)
- Minds, Machines & Evolution (New York: Bantam Books, 1985)
- The Proteus Operation (New York: Bantam Books, 1985)
- Endgame Enigma (New York: Bantam Books, 1987)
- The Mirror Maze (New York: Bantam Books, 1989)
- The Infinity Gambit (New York: Bantam Books, 1989)
- The Giants Novels (New York: Ballantine Books/Del Rey, 1991)
- Entoverse (New York: Ballantine Books/Del Rey, 1991)
- The Multiplex Man (New York: Baen Books, 1992)
- Out of Time (New York: Bantam Spectra, 1993)
- The Immortality Option (New York: Ballantine Books/Del Rey, 1995)
- Realtime Interrupt (New York: Bantam Spectra, 1995)
- Paths to Otherwhere (New York: Baen Books, 1996)
- Bug Park (New York: Baen Books, 1997)
- Mind Matters: Exploring the World of Artificial Intelligence (New York: Ballantine Books/Del Rey, 1998)
- Star Child (New York: Baen Books, 1998)
- The Cradle of Saturn (New York: Baen Books, 1999)
- Rockets, Redheads and Revolution (New York: Baen Books, 1999)
- Outward Bound: A Jupiter Novel (New York: Tor, 1999)
- The Legend That Was Earth (New York: Baen Books, 2000)
- Martian Knightlife (New York: Baen Books, 2001)
- The Anguished Dawn (New York: Baen Books, 2003)
- Kicking the Sacred Cow: Heresy and Impermissible Thoughts in Science (New York: Baen Books, 2004)
- Catastrophes, Chaos and Convolutions (New York: Baen Books, 2005)
- Mission to Minerva (New York: Baen Books, 2005)
- The Two Moons (New York: Baen Books, 2006)
- The Two Worlds (New York: Baen Books, 2007)
- Echoes of an Alien Sky (New York: Baen Books, 2007)
- Moon Flower (New York: Baen Books, 2008)
- Migration (New York: Baen Books, 2010)
- Worlds in Chaos (New York: Baen Books, 2014)
- Prisoners of Tomorrow (New York: Baen Books, 2015)
- Cyber Rogues (New York: Baen Books, 2015)