Ethereum JavaScript API

https://github.com/ethereum/web3.js

Lightweight Java and Android library for integration with Ethereum clients

https://github.com/web3j/web3j

https://web3j.io/

Web UI for signing Plasma transactions

https://github.com/matterinc/PlasmaWebUI

DiveLane - Universal Ethereum payment system

https://github.com/matterinc/DiveLane

Elegant Web3js functionality in Swift. Native ABI parsing and smart contract interactions on Ethereum network

https://bankex.github.io/web3swift/

Elegant Web3js functionality in Swift. Native ABI parsing and smart contract interactions

https://github.com/matterinc/web3swift

Mastering Ethereum

作者：Andreas M. Antonopoulos、Dr. Gavin Wood，

https://github.com/ethereumbook/ethereumbook/blob/develop/book.asciidoc

Cryptographic javascript-functions for ethereum and tutorials to use them with web3js and solidity

https://github.com/pubkey/eth-crypto

A starter boilerplate for an Ethereum dapp using web3.js v1.0, truffle, react, and parity

https://github.com/leopoldjoy/react-ethereum-dapp-example