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xlwings
xlwings is a Python library that makes it easy to call Python from Excel and vice versa. It works with Excel on Windows and macOS as well as with Google Sheets and Excel on the web.
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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.
Reading the headline, I initially thought that Microsoft bought the company behind XLWings [1], which also enables you to use Excel directly within Excel, even locally. Not affiliated in any kind to that company, just used it in the past.
[1] https://www.xlwings.org/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.