These fonts represent translation to PostScript Type 1 of the ESSTIX fonts. ESSTIX seem to have been a precursor to the STIX project, and were donated by Elsevier to that project.
The accompanying virtual fonts with customized metrics and LaTeX support files allow their use as calligraphic, fraktur and double-struck (blackboard bold) in maths mode.
The author is Michael Sharpe.
License: ofl Version: 1.0 Catalogued: 2015-08-03