Need help identifying which software made these pictures (it's an odd question, I know)

So my friend is teasing me because he found an application (apparently free, but I don't know if I believe him) which allows you to click and drag your mouse, and it creates symmetrical patterns. He sent me these pictures through skype, and I really like them, and I want to know which application he used, so that I can create my own, unique wallpapers, or gaming display pictures, or whatever, but he refuses to tell me what he used to make them. (He screen-shared and showed me that he did actually make them himself, not Google images, but It didn't say the name of the software anywhere).

I would really appreciate it if anyone could tell me what he used to make these. The pictures are at the links below:
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