The Legend of Nayuta: Boundless Trails (Nayuta no Kiseki) which is seemingly unconnected to the rest of the Trails series.
Trails into Reverie features Lloyd from the Crossbell games, Rean from the Erebonia games, and a mysterious third protagonist named C. Lastly, there’s The Legend of Heroes: Kuro no Kiseki.
Four The Legend of Heroes Trails games that have yet to be localized in the West were found to be listed on Epic Games Store on PC.
The Crossbell games were only fan translated, most notably by The Geofront team these past years.