Over at Suvudu Free Library there are five free ebooks to download in .pdf:

T. A. Pratt: Blood Engine (urban fantasy)
Naomi Novik: His Majesty’s Dragon (alternate history with dragons)
Harry Turledove: Settling Accounts: Return Engagements (alternative history)
Kim Stanley Robinson: Red Mars (hard science fiction)
Robin Hobb: Assassin’s Apprentice (epic fantasy)