Etherscan
Etherscan is the leading BlockChain Explorer, Search, API and Analytics Platform for Ethereum, a decentralized smart contracts platform. Built and launched in 2015 it is one of the earliest and longest running independent project built around Ethereum and its community with the mission of providing equitable access to blockchain data.
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ethers (ethers.eth)
The ethers.js library aims to be a complete and compact library for interacting with the Ethereum Blockchain and its ecosystem. It is ofen used to create decentralized applications (dapps), wallets (such as MetaMask and Tally) and other tools and simple scripts that require reading and writing to the blockchain.
Pentacle
Pentacle offers a platform aimed at simplifying the understanding and engagement with cryptocurrencies and Web3 for users at various skill levels. It provides extensive resources, including project information covering aspects like yield, audits, governance, and developer tools, alongside a knowledge base curated for different levels of expertise in the crypto space.