First of all, this continues to change and will be extremely interesting to work with over the next number of years. There are a number of interesting use cases ad much is about rethinking the web infrastructure.
Wallets
Security
- Coinbase - A marketplace
L2 Blockchain
- Polygon -
Finance
Digital Collectables (NFTs)
- OpenSea - First and currently the foremost NFT platform supporting the ethereum and L2 Polygon chains