From the Publisher's website:
Adamant Entertainment is an Origins-Award-nominated and Ennie-Award-honorable-mention design studio. Our products range from critically-acclaimed visions of alternate history, renowned for depth of research and quality of design, to the pulse-pounding excitement of our Thrilling Tales d20 pulp series.
Adamant also produces PDF support for several RPG lines from other publishers, including Freeport from Green Ronin, Northern Crown from Atlas Games, and d20 versions of Pulp Hero products from Hero Games.