Just released a set of
four fonts on Shadekeep that are free to use in your adventures. You can use them to create props for your players or coded documents that only those who "speak" the language have the key for. Or you can just sprinkle them in as decorative ornaments in your designs. While originally designed for The Fantasy Trip, they can also stand in for alien languages and other strange tongues in systems like GURPS, too.
Hope you enjoy them!