As a publisher's first (KickStarted) project, Heroes of Thornwall
is a 160 page mini-setting meant to serve as a campaign starter for heroes of humble beginnings.
In spite of its size and production values, the PDF is free and only the physical hardcover costs anything. I downloaded it, and in addition to looking nice it makes for a good 'starting town' for PCs. One of the more innovative ideas it has is the Goodwill system, where PCs who help complete quests and aid townsfolk gain points which can be spent for in-game benefits. This is meant to help tie the party to the locale as well as giving them incentive to help out folks beyond monetary reward.
What is weird about it for me is that it takes place in its own campaign setting, Aetaltis, and several of the new races have NPC stat blocks but no write-ups on how to play as them. This feels odd for a campaign starter in that it ties into the history of the world which may not be present, and there are hints of a rising tide of darkness and a unique pantheon of gods. It feels more like the first part of an adventure path or series of setting books.
But other than this, it's pretty much set in generic D&D fantasy land and should be broadly compatible with most low-level agrarian settings.