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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I am assuming you mean xlsx file format. We had a requirement to generate xlsx files with potentially millions of rows and we can't keep the whole file in memory, which ruled out all the existing libraries. I ended up writing https://github.com/ananthakumaran/xlsx_stream. I have also written a blog about the general idea. Abstraction wise, it's very low-level as you have to create all the XML files by hand. Flexibility wise it allows to do anything that's possible in Excel. I started out by just unzipping an existing xlsx file and used that as the starting point.
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