The Change Series Emberverse I
A trilogy set in the world that the island of Nantucket left behind when it became an "Island in the Sea of Time". This world is hit by "The Change" causing electricity, high gas pressures, and fast combustion (including explosives and gunpowder) to stop working. This is very bad news for the majority of the population, but the books follow some of the survivors and show how different groups choose different ways to adapt to the changed world.
The Sunrise Lands Series Emberverse II
A series set in the same world as the "Dies the Fire" trilogy, but about 25 years later. It's a generation after high-energy technology died in a catastrophe most of the human race didn't survive. The children born after the Change are now starting to take center stage—and Whoever or Whatever was behind the Change itself may be taking a hand in their rivalries. An expedition must travel to Nantucket across a strange and hostile continent to find some answers.
The Montival Series Emberverse III
Rudi, now hailed as Artos, the High King of Montival, returns with the Sword, forming a coalition against the Prophet. Important events that occurred in the years when Rudi and the questers were away on their search for the Sword are explained, and preparations for the final battles against the Prophet and Boise are described, providing a set-up for the concluding volumes.
The Sacrifice Book Emberverse IV
This can also be seen as the last book of the Montival (Emberverse III) series.
Rudi’s Children Emberverse V
A new "Emberverse" series. It's two generations after high-energy technology died in a catastrophe most of the human race didn't survive. The children born after the Change and their children are again battling against powers that are not sympathetic to humans and human concerns.
Island in the Sea of Time
In Island in the Sea of Time the island of Nantucket is transported by an unknown phenomenon (called "The Event" in the series) back in time into the Bronze Age circa 1250s BC (corresponding to the late Heroic Age of Greek mythology). The trilogy describes the conflict between the different factions of the island's population—some trying to dominate the world for their own benefit, others trying to better it, while most just want to survive, work hard, and claw their way back to something approaching their pre-Event way of life.
Shadowspawn
The Urban Fantasy series features "Shadowspawn", an ancient subspecies of Homo sapiens who formed the basis of legends about vampires and werewolves and have been secretly controlling the world for most of the 20th century.
Conquistador
A Parallell Worlds/Alternate History novel, published in 2003 by ROC. The book is set in an alternate world where the Europeans never conquered the Americas, and there is a "gate" between our California and the alternate California.
Peshawar Lancers
An Alternate History novel, set in about 2025 AD in a world that was hit by some comet fragments in 1878, depopulating much of the Northern Hemisphere from Russia to North America. Published in 2002 by ROC.
The Lords of Creation Duology
What if Mars and Venus really were inhabitable and inhabited, like in many SF stories from the early sixties and before? In this series Mars and Venus have been terraformed a long time ago and "seeded" with Earth life, including several different human species. On Earth everything is the same until the start of space exploration, but then the cold war turns into a real space race... "The Sky People" is set on Venus, "In the Courts of the Crimson Kings" on Mars.
Draka
The Draka novels postulate a dystopian slave-holding militaristic (white) African empire founded by British Loyalists who escaped to South Africa after the American Revolution rather than to Canada (as in our history). They were later joined by French Royalist émigrés, Icelandic refugees, and demobbed veterans of the Napoleonic Wars, then by tens of thousands of defeated Confederates after the American Civil War.
Clan of the Claw
A series published by Baen, with each volume containing four new linked novellas from best-selling authors. The extinction asteroid didn't strike Earth, and the dinosaurs kept evolving—but so did the mammals, and now it’s cold-blooded, magic-using reptiles against the hot-blooded, hot-tempered descendants of cats.
Terminator 2
Return to the blockbuster Terminator universe, with the untold adventures of Sarah and John Connor!
Anthologies, and/or stories not part of listed series
S.M. Stirling's anthologies, and/or stories in other anthologies not part of his listed series.
The General
S.M. Stirling and David Drake have written the "General" or "Raj Whitehall" series. The books have been reissued in hardcover and ebook formats by Baen Books.
Tales from The Black Chamber
An Alternate History series, that takes place from 1916 in a world where Theodore Roosevelt became president of the U.S.A. in 1912, and features a covert-ops organization named "“The Black Chamber".
Make the Darkness Light
A new time travel series, where a group of modern historians arrive in the Roman Empire in 165 A.D. just in time to help restore the Pax Romana in the Marcomannic Wars.