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An add-on is an extension that can be presented as any engine addition: plugin, library, material, asset pack, etc.
Add-ons can be downloaded from Add-On Store at https://store.unigine.com/. Add-On Store contains add-ons created by UNIGINE and add-ons created and uploaded by users. Depending on the add-on usage conditions, add-ons can be downloaded free of charge or upon payment. For more details, see the Add-On Store documentation.