What website adds networks to MetaMask?

I'm curious to know, which specific website or platform allows users to integrate and add new networks to their MetaMask wallet? MetaMask is a popular browser extension and mobile app that enables users to store, send, and receive cryptocurrencies and digital assets across various blockchains. As the blockchain ecosystem continues to expand, it's essential for users to be able to connect to and interact with various networks seamlessly. So, I'm wondering if you could shed some light on the process of adding networks to MetaMask and which website facilitates this?