Oh My Zsh is a delightful, open source, community-driven framework for managing your Zsh configuration. It comes bundled with several helpful functions, helpers, plugins, themes, and a few things that make you shout... OH MY ZSH!
Source: I'm a zsh user... Not all bash scripts work in zsh, and almost none of my own zsh scripts work in bash (hello arrays my old friends). I can't tell you how many times I've been driven up the wall due to a program not producing an expected output only to find dropping into bash solves it. So no, it doesn't belong here.