Because you asked, we listened: Incstone Design now makes OpenType fonts in addition to TrueType!  In previous years, we were not able to meet this demand due to our software, but due to recent upgrades, Incstone now offers the fonts in both formats!

As of this writing, only our Orthotopes and Voynich fonts are available in both, but we hope to make our whole catalog available soon, so stay tuned!