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Schematiq - https://www.schematiq.com also handles source control for spreadsheet and a lot more. The platform is about making sheets enterprise grade applications - regression, testing, CI etc and introduces new features to simplify spreadsheet logic.
Re:Ask HN: What do you use to open large CSV files? on Tuesday August 15, 2017 @09:41AM (#15018056)
http://www.schematiq.com - files are loaded externally from the Excel process but are transparently accessible from within Excel.