Among works not set in the "Freehold" universe is Williamson's second novel, "The Hero" (2004), which was written with John Ringo and made the "Locus" Bestseller list in February 2006. The book is a part of the "Legacy of the Aldenata" series. It appeared in German as "Invasion – Heldentaten" and in Russian as "Герой". Williamson has also written the "Target: Terror" (2004–2005) military fiction series which is set in the world of the "" arcade game. His stand-alone novels include the time-travel story "A Long Time Until Now" (2014) which was praised for its characterization and survivalist elements. As of 2016, Williamson's books had sold half a million copies.