Grin Olsson's Asgard Series is free right now... I haven't read him before but the series looks good, using Norse Mythology as its base
Planet of the Gods is the first in the series:
This is the first of five books in the GrinOlsson's Asgard Science fiction series.
In ancient days, mankind by word of mouth passed on their history from the ancient fathers and mothers throughout the generations, to their present day sons and daughters. These ancient peoples used descriptive basic words to explain an advanced technological species of intelligent beings that used their chariots to travel on land, in the sea, and through the air, as well as the contact they had with humans. The third planet from the sun, our “Earth” was identified in their ancient language as Midgard or the middle planet. The ancient scrolls and sagas detail other worlds in a great inter planetary battle called Ragnarok where a planet named Asgard was destroyed. In the fifth orbital energy ring of our sun lays a belt of asteroids from another historical time, where an ancient fifth planet somehow was destroyed.
Ratings are sparse or nonexistent. Try and see for yourself, I guess.