Write.scad by HarlanDMii — https://www.thingiverse.com/thing:16193
License: Creative Commons Attribution-ShareAlike (CC BY-SA).
Copied unmodified from https://github.com/rohieb/Write.scad @ 3ba5a7069580447bb08e36bf37d41ec68eeddc77 (a mirror of the Thingiverse thing).
The author's README adds: "You are welcome to use and distribute this code freely. no need to make it a derivative of write.scad".
Its DXF fonts are carried by the engine; see packages/cad-engine/fonts/WRITE-SCAD-NOTICE.txt.