This package provides OpenType math support in (plain) XeTeX. See unimath-plain-xetex-doc.pdf for more information.
If anybody wants to maintain this package, please email alphaztx at 163 dot com.
Happy TeXing!
This work may be distributed and/or modified under the conditions of the LaTeX Project Public License, either version 1.3c of this license or (at your option) any later version.