xlwings CE is a BSD-licensed Python library that makes it easy to call Python from Excel and vice versa:

• Scripting: Automate/interact with Excel from Python using a syntax that is close to VBA.
• Macros: Replace your messy VBA macros with clean and powerful Python code.
• UDFs: Write User Defined Functions (UDFs) in Python (Windows only).
• REST API: Expose your Excel workbooks via REST API.

Numpy arrays and Pandas Series/DataFrames are fully supported. xlwings-powered workbooks are easy to distribute and work on Windows and Mac.

xlwings CE includes all files in the xlwings package except the pro folder, i.e. the xlwings.pro subpackage.

The purpose of xlwings PRO is to finance the continued maintenance and enhancement of xlwings. This will allow you to rely on the package without being left with the dreaded "this library currently has no active maintainers" message that happens to too many open-source packages after a couple of years.

To get access to the additional functionality of xlwings PRO, you need a license key and at least xlwings v0.19.0. Everything under the xlwings.pro subpackage is distributed under a commercial license, see https://github.com/xlwings/xlwings/blob/master/LICENSE_PRO.txt.

• For current features and pricing: https://www.xlwings.org/pricing
• To request a trial license key: https://www.xlwings.org/trial

• Homepage: https://www.xlwings.org
• Quickstart: https://docs.xlwings.org/en/stable/quickstart.html
• Documentation: https://docs.xlwings.org
• Video Course: https://training.xlwings.org/p/xlwings
• Source Code: https://github.com/xlwings/xlwings

The Excel add-in is version controlled with xltrail. You can see the diffs here.