Can we use/run babylon sandox code in our local system to build a 3d viewer?
Hello and welcome!
Babylon.js is covered with Apache 2.0 license - Babylon.js/license.md at master · BabylonJS/Babylon.js · GitHub
So the answer is “YES”, if you don’t break the license terms.
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Yup feel free to fork and reuse as much as you want 
The only ask but totally not mandatory is to come back and let the community know of the great things you are building
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Seconding on if you can, please show us what you build! We LOVE to see what the community is doing 
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