Just a working list of published works and media of other than AH.com origins that have their own wiki page.
The 163x (Ring of Fire) series (Eric Flint and co.)
1984 (George Orwell) - Not fully proper AH, but has influences on the genre.
The Atlantis series (Harry Turtledove)
Bring the Jubilee (Ward Moore)
The Cusanus Game / Das Cusanus Spiel (Wolfgang Jeschke - German AH)
The Draka series (S. M. Stirling)
For Want Of A Nail (Robert Sobel)
Guns of the South (Harry Turtledove)
The Island in the Sea of Time (Nantucket) series (S. M. Stirling)
The Peshawar Lancers (S. M. Stirling)
Romanitas (Sophia McDougal)
The Southern Victory (TL-191) series (Harry Turtledove)
The Worldwar series (Harry Turtledove)
GURPS Alternate Earths & GURPS Infinite Worlds (Steve Jackson Games)
Crimson Skies (FASA, WizKids, Microsoft)
Crimson Skies (FASA, WizKids, Microsoft)
Command and Conquer: Red Alert Westwood Studios, Electronic Arts)
Sliders (Fox, The SciFi Channel)