NIST DTSA-II is "Power tools for X-ray Microanalysis."

NIST DTSA-II depends upon the EPQ library which is available here https://github.com/NicholasWMRitchie/EPQ

Installable versions of NIST DTSA-II are available here https://cstl.nist.gov/div837/837.02/epq/dtsa2/index.html