There are many item response theory software packages designed for users. Here, the authors introduce an environment tailored to method development and simulation. Implementations of a selection of classic algorithms are available as well as some recently developed methods. Source code is developed in public repositories on GitHub; your collaboration is welcome.

中文翻译：

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OpenMx：项目响应理论方法开发的模块化研究环境

有许多为用户设计的项目反应理论软件包。在这里，作者介绍了一个为方法开发和模拟量身定制的环境。一些经典算法的实现以及一些最近开发的方法都是可用的。源代码在 GitHub 上的公共存储库中开发；欢迎您的合作。