In terms of hard math (and/or advanced CS) being used in them, some projects are in my humble opinion just too advanced for (and/or intimidating to) majority of users; not only for beginners among us.
Can, please, such projects have their own subcategory, for example, "Share your Advanced CS Projects", or something similar?
I wasn't asking for my own projects (as I don't think they contain such an advanced CS to be intimidating to beginners, anyway). What I had in mind were other people's advanced projects, for example like this, or this.