FeynML from https://feynml.hepforge.org/
FeynML is a project to develop an XML dialect for describing Feynman diagrams as used in quantum field theory calculations. The primary aim is to unambiguously describe the structure of a diagram in XML, giving a de facto representation for diagram structure which can be easily translated into another representation.
pip install [--user] feynml
or from cloned source:
poerty install --with docs --with dev
poetry shell