Beyond George R. R. Martin

Winter is coming and so is the next book in the Song of Fire and Ice series but while you wait for GRRM to write it try these:

Similar authors

Joe Abercrombie

Scott R Bakker
Jacqueline Carey

Dorothy Dunnett
Kate Elliott

Raymond E Feist
Jennifer Fallon
Diana Gabaldon
Barbara Hambly

Robin Hobb

Robert Jordan

Greg Keyes
Mark Lawrence
Scott Lynch
Juliet Marillier

Naomi Novik
Patrick Rothfuss

J. R. R. Tolkien

Tad Williams

Similar Series

Sarah Ash - Alcymist's legacy
Daniel Abraham - The dagger and the coin and The long price quartet.
Steven Erikson - The Malazan book of the fallen

Dune series - various authors 

Robin Hobb - Farseer trilogy

Joel Shepherd - Trial of blood and steel

Brent Weeks - Lightbringer