Here are a few examples of Ethereum node providers that can be used as a provider in Web3.js:
Infura: Infura is a popular Ethereum node provider that offers both mainnet and testnet nodes. It allows developers to connect to the Ethereum network without running a local node.
Alchemy: Alchemy provides fast and reliable Ethereum nodes, as well as additional tools and features for developers. It also supports both mainnet and testnet connections.
QuickNode: QuickNode offers Ethereum nodes for both mainnet and testnet, with options for dedicated or shared resources. It also provides additional features such as monitoring and analytics.
Geth: Geth is a popular Ethereum client that can be used as a node provider for Web3.js. Developers can run their own Geth node or connect to an existing one.
OpenEthereum: OpenEthereum, formerly known as Parity, is another popular Ethereum client that can be used as a node provider. It supports both mainnet and testnet connections.
These are just a few examples of Ethereum node providers that can be used with Web3.js. There are many other providers available, and developers can also run their own Ethereum node if they choose to do so.