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Is there anyone doing anything like this out in open-source land?

Is there anywhere I should go to find open-source resources for Excel?

It seems like most Excel stuff that is easy to find is distributed similarly to this tool. Managing macros in source control is annoying!

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govert's excellent ExcelDNA [1] enables one to build XLL Addins in .Net. Many use it for crafting Excel extensions, including BlockSpring. I used it for SSAddin [2] to build cron jobs as well as tiingo and quandl downloads in Excel.

[1] https://github.com/Excel-DNA [2] https://github.com/SpreadServe/SSAddin

About source control in Excel, there's a London based company offering a product along those lines called Pathio (https://www.pathio.com/). I know it's not open source, but I'm mentioning it just in case you find it interesting. I actually had a pleasant chat with the founder of Pathio a few months ago, so figured I'd plug the product:)

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