Is there a software with which you can visualise a complex function?

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I just discovered that complex functions exist, and that you need four dimensions to represent them (i.e. three space dimensions and one represented by colours => Riemman’s surfaces). I was wondering if there is any software or programme that can help me visualise an arbitrary complex function that I want to input. I would be really grateful if someone could help me with this. I love seeing functions alive, especially in four dimensions :)