This question already has an answer here:

I am new in the ArcGIS world, and I want to know if there is a site or place where people share their models and scripts for free. Like an Open source of tools for ArcGIS, for example.

merged by PolyGeo Oct 12 '17 at 10:22

This question was merged with Sharing Open Source Python/ArcPy Code and Models for ArcGIS Desktop? because it is an exact duplicate of that question.