Anno Dracula (Kim Newman)

The Bloody Red Baron (Kim Newman)

The Draka Series (S.M. Stirling):
     Marching Through Georgia
     Under The Yoke
     The Stone Dogs
     Drakon

Einstein's Bridge (John Cramer)

Fatherland (Robert Harris)

Making History (Stephen Fry)

The Man in the High Castle (Philip K. Dick)

Of Tangible Ghosts (L.E. Modesitt, Jr.)

Pavane (Keith Roberts)

The Proteus Operation (James P. Hogan)

The Timeline Wars (John Barnes):
    #1: Patton's Spaceship
    #2: Washington's Dirigible

The Two Georges (Harry Turtledove and Richard Dreyfuss)

Voyage (Stephen Baxter)

The Worldwar series (Harry Turtledove)