lme4

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Author: Douglas Bates, Martin Maechler, Ben Bolker, Steven Walker, Rune Haubo
Contact: https://cran.r-project.org/web/packages/lme4/index.html
Description: lme4: Linear Mixed-Effects Models using 'Eigen' and S4. Fit linear and generalized linear mixed-effects models. The models and their components are represented using S4 classes and methods. The core computational algorithms are implemented using the 'Eigen' C++ library for numerical linear algebra and 'RcppEigen' glue.
Analyses: DIF; Equating; Item & Test Analysis; Reliability; Scaling; Scoring; Rasch models
System Requirements: Windows, Mac OS, & Linux
Measurement Model: Rasch
License Type: Open-Source (R)
Documentation: user manual, sample datasets

Software License
Open-Source (R)
Measurement Model
Rasch
Analysis
Differential Item Functioning; Equating; Item & Test Analysis; Reliability; Scaling; Scoring