pyIGTLink 
Python implementation of OpenIGTLink
ALso support sending data from Matlab over IGTLink
Only ImageMessages TransformMessages are implementated at the moment.
Python 2.7 and Python 3 support. Tested with CustusX and 3D Slicer.
Install
pip install pyIGTLink
Example
python pyIGTLink.py - Will send 2D image with random noise as local server
python pyIGTLink.py 1 - Will send 2D image with moving circle as local server