Ronin Arts is a role-playing game company founded as a join venture by Philip J. Reed and Christopher Shy in 2003, to some degree a successor to Shy's Studio Ronin and Reed's selling of role playing games PDFs from his blog
Ronin Arts published at some point, among other products The Whispering Vault, Star Ace and support products of other RPGs.
As of March 2015, Ronin Arts' website is no longer active, having apparently been let go as of late 2012 or early 2013. Many of its products are still available by way of Lulu, Warehouse 23 and Paizo Publishing.