So, I don't see the "new" in NFTs, they have been here for quite some time - creary.net is an existing platform, where you can upload / buy / sell digital art for some years now - but NFT adds standardization and wide adoption of the concept. Source: over 2 years ago

The creary network maybe? https://creary.net/. Source: about 3 years ago

Creating and managing NFTs on Tezos is both sustainable and practical, due to the low energy consumption and low fees of the Tezos blockchain. Plus, the large ecosystem that exists on Tezos and the developers, artists and collectors make it a great fit for NFTs. Most Tezos NFTs can be found at a Tezos (hosted/compatible) NFT Marketplace such as Objkt, Kalamint and Rarible. - Source: dev.to / over 1 year ago

There are a number of famous marketplaces where you can list your own NFTs and trade them. Here’s a list of some of them: Opensea, Crypto.com, Rarible. - Source: dev.to / almost 2 years ago

Rarible — the first NFT marketplace owned by the crypto community. Source: about 2 years ago

Some popular NFT Marketplaces that support Ethereum include, OpenSea, Rarible, Nifty Gateway, SuperRare, and many others. Ethereum Wallets, MetaMask, and Ledger are examples of wallets you can use to transact on the Ethereum blockchain. - Source: dev.to / about 2 years ago

Currently, there are decentralized applications (Dapps) that serve as marketplaces and aid in the minting and trading of NFTs. Examples of those are OpenSea, Rarible, LooksRare, Foundation, Magic Eden, etc. - Source: dev.to / about 2 years ago