No need to open source. Just to pick some examples to build something similar to Amazon's fulfillment part as it was like 6 years ago: Shopify as the front end

No need to open source. Just to pick some examples to build something similar to Amazon's fulfillment part as it was like 6 years ago: Shopify as the front end CargoWise for transportation, warehousing and everything logistics Which leaves some of the more sophistiticated stuff like demand ballancing across the network, but that is doable by either developing something in-house or throwing an ERP system into tue mix. All available off the shelf as we speak. There are other reason why nobody manages to seriously challenge Amazon.