Item response theory (IRT) is a class of measurement models extensively used in education. Curently, many softwares are available (e.g. BILOG-MG) for the estimation of item and examinee parameters. Among these softwares, one must mention ICL and R, which are free and allow to produce to a large variety of analyses. The main objective of this study is to use the Rasch model to compare the quality of estimation of the difficulty and subject parameters. Here, we will compare item parameters through three software packages: BILOG-MG, ICL and the R package ltm. The demonstration will be twofold: we will make a simulation study and an analysis of an English proficiency test, as second language. Our results show that these softwares obtained similar parameters estimates, their main difference pertaining to their respective computation times.