A Star for Queen Zoë (2016)

Publisher's blurb:

A Star for Queen Zoë is a setting for starting a space opera campaign in a post-breakdown type humancentric universe. It is intended to be used with the Interstellar Overthruster procedural mapping rules, but can exist as a standalone resource. In a universe where a great human empire collapsed, isolated colonies are gradually returning to the stars. Planet Essex is one such planet that while limited by 18th century technology your PC's queen has tasked them with using an ancient space ship to explore and establish a space empire... before its too late.

This supplement contains an overview of the political situation on Essex, maps and add on rules to work with your RPG of choice to give it flavor. The intent is that this is a springboard for a 'Starbox' campaign, and is not an actual adventure in and of itself. Its inspired by classic space opera authors like Harry Harrison, Jerry Pournelle, etc.