Scientific Software International (SSI)

HLM
HLM provides statistical tools for comprehensive hierarchical data modeling.

LISREL
LISREL provides tools for structural equation modeling, data manipulations and basic statistical analyses, hierarchical and non-linear modeling, generalized linear modeling, and generalized linear modeling for multilevel data.

BILOG-MG 
BILOG-MG is an extension of BILOG that is designed for the efficient analysis of binary items, including multiple-choice or short-answer items scored right, wrong, omitted, or not-presented.

PARSCALE 
PARSCALE implements Item Response Theory (IRT) measurement methods for binary, multiple-category and rating-scale items.

SuperMix
SuperMix is an application for comprehensive mixed-effect modeling.

Auxal
Auxal performs both structural and nonstructural auxological analysis of human growth in standing height or recumbent length.