The repositories described later offer information about a specific class of models to their user communities, and, in this context, they are similar in their capabilities to the MREP. None of them, however, catalogs infectious disease models and none of them attempts to maintain a version-controlled environment that offers code to the users from a stable, documented environment provided by a version-managed system. Nevertheless, all of the examples offer their users annotated models, and all are concerned about providing reliable programs with usable documentation.