IRT Software
Rasch Model Analysis:
RASCAL, Quest, ConQuest, RUMFOLD/ss/pp, RSP,BIGSTEPS

Two- and Three-Parameter Model Analysis:
XCALIBRE, BILOG-MG, PARSCALE,TESTFACT

Polytomous Models: MULTILOG, PARSCALE
Nonparametric Models: MSP, PARELLA

Dimensionality Assessment:
MicroFACT, TESTFACT, LISREL, NOHARM

Multidimensional Models:
TESTFACT, NOHARM

Test Development Utilities: PARDSIM, TESTINFO, SCOREALL, POSTSIM