One of the fundamental design goals of the geoprocessing framework is the ability to distribute your tools among the ArcGIS community of users. Sharing tools is one of the primary uses of ModelBuilder—to create reusable workflows that can be run by different users or with different data.
Learn more about sharing models and model tools
The Analysis and Geoprocessing Tool Gallery contains models written and shared by users like you. See Introduction to the gallery for more information.