The ACES project includes includes a XML-based LUT format known as the “Common LUT Format”, or CLF. The format is documented here and here.
In support of the ACES 1.0 release, a Python reference implementation for the format was created. This includes support for all of the features in the specification, some of Autodesk’s proprietary extensions as well as a few small extensions of my own.
The github repo is here: CLF