It's very simple dapp which mint nft. It's ERC721 standard and is developed using Flutter.
Below is demo screen,
This smart contract is deployed to Goerli Testnet at -> 0x835DaAfD9F1F4b974408c4255B59A9e753728cA0. Its demo is available at --> https://nationalism-millime.000webhostapp.com/nft/#/