Which e-commerce platform technology was adapted into the widely-used government procurement system 'GovMarket' that revolutionized how federal agencies purchase goods and services?

In recent years, governments worldwide have been adopting digital platforms to enhance citizen services and streamline operations. These e-governance platforms represent significant public-private partnerships and technological investments. How well do you know the major players and developments in this growing sector of government technology procurement?

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Amazon's marketplace architecture, licensed and modified by the General Services Administration in 2018
Shopify's storefront system, acquired and repurposed by the Department of Commerce in 2019
Alibaba's wholesale platform, implemented through a joint venture with the Treasury Department in 2020
eBay's auction technology, adapted by the Defense Logistics Agency in 2017