Das Adler-Bräu is a contract brewed Schwarzbier by Hetzel in Frauendorf that is a great example of the style and worth seeking out.
Wolf Urtyp Dunkel is one of the best dark beers I've had in Germany, with a dry hoppy palate that has a chewiness which is hard to describe.
Schroll Bock is a dark rich beauty with a hint of licorice and a fine dryish bittersweet finish.
Gradl's everyday dark beer is one of Bavaria's finest and their elusive Maibock follows for, with a rich malty palate that dries moreishly in the long bittersweet finish.
Herold Maibock is gorgeous big dark Bock, with some fried fruit before the long dry, bittersweet finish.
Reh Lanbier Dunkel is a classic Franconian lager with a soft fruity palate and clean bittersweet finish.
Reichold Dunkles is a tasty balanced dark brew with a hint of chocolate and a semi-dry, bittersweet finish.
Weiherer is a great brewery with both traditional and craft beer offerings. Schwarzla is a bit of a cross, full and rich but still an approachable and super drinkable brew.
Schwarze Anna is perhaps the best beer at the Annafest and certainly the most different. It's a real black beauty.
Held-Bräu Dunkles Braunbier is a much revered Dunkles in Franconia, full of rich malt with a hint of chocolate before the dry finish.