Ethereum Compatibility
Harmony & Ethereum tooling compatibility
Harmony ONE is an Ethereum EVM 100% compatible blockchain, and is very good at decentralized application (Dapp) development within many possible verticals including DeFi, NFT, Gaming, and many others.
You can read more about Harmony One Ecosystem - here

Useful articles:

Harmony & Web3

Harmony & Metamask

Harmony & Ethereum Developer Ecosystem

hmy-ecosystem/ at main · harmony-one/hmy-ecosystem

Examples of Harmony projects that use Ethereum RPC

Harmony ONE-ETH Bridge
GitHub - harmony-one/ethhmy-bridge.sdk: Horizon Bridge SDK