GPlates is developed by an international team of scientists and professional software developers at:
Collaborating scientists at the University of Sydney, the Norwegian Geological Survey and CalTech have also been compiling sets of global data for plate boundaries, continental-oceanic crust boundaries, plate rotations, absolute reference frames and dynamic topography.
There are two mailing lists relevant to people interested in GPlates:-
For scientific or organisational queries...
For technical issues or queries about GPlates software development...