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Is the Tobii 4C supported by OpenSesame?
The question should be is the Tobii 4C supported by Pygaze. According to the documentation, Tobii eyetrackers appear to be supported. Whether that particular model is, I don't know. @Edwin might know, though.
Important disclaimer: I do not have a 4C, and no affiliation with Tobii, so I don't know anything for sure.
What I do know, is that Tobii did mention that the 4C should work with the new Pro SDK, which is supported by PyGaze (and by extension OpenSesame). However, I do think they requested you contact them if you want to use the 4C for research purposes. So best inquire with them (Can heartily recommend it! Their engineers developed with PyGaze/OpenSesame's Tobii Pro SDK support, so they're aware of our software, and keen to help.)