There are a fair number of timelines...
What springs to mind immediately, aside from Rast's
A Shift in Priorities:
Marne Without Moltke by Wiking: An early well-timed death of Moltke the Younger prevents diversion of forces to the Eastern Front and Lorraine, resulting in a deeper German penetration on the Western Front, including some of the Channel ports. The timeline remains incomplete.
Prince Henry of Prussia: The Rise of U-Boat by BlondieBC. The Kaiserliche Marine makes an earlier investment in submarines, leading to spectacular results, lots of sunken British warships, and big butterflies.
Es Geloybte Aretz - a Germanwank by Carlton Bach - a little further afield, this being a timeline with an 1888 point of departure, and a Great War (without Britain and France) that happens almost a decade earlier. But it's a Central Powers victory in the making just the same. (Still active)