NIST

Free
EVAP-COND is a package that contains NIST's simulation models
Free
It extracts spectra for individual components in a GC/MS data file
Free
Stripped down version of REFPROP for teaching thermodynaics
Free
SimReadW also replaces the command-line interface of SimRead3
Free
Agencies must use NIST SP 800-53 and 800-53A for security control specification and assessment respectively