OpenZeppelin is a library for writing secure Smart Contracts on Ethereum. With OpenZeppelin, you can build distributed applications, protocols and organizations. It is meant to provide secure, tested and audited code to enable the new generation of distributed applications, protocols and organizations. OpenZeppelin is a community effort to reduce the hurdle to develop and use them.

OpenZeppelin - A Framework to build secure smart contracts on Ethereum

Truffle is the most popular development framework for Ethereum with a mission to make your life a whole lot easier. With Truffle, you get:
<ul>
<li>Built-in smart contract compilation, linking, deployment and binary management.</li>
<li>Automated contract testing with Mocha and Chai.</li>
<li>Configurable build pipeline with support for custom build processes.</li>
<li>Scriptable deployment &amp; migrations framework.</li>
<li>Network management for deploying to many public &amp; private networks.</li>
<li>Interactive console for direct contract communication.</li>
<li>Instant rebuilding of assets during development.</li>
<li>External script runner that executes scripts within a Truffle environment.</li>
</ul>

Truffle is the most popular development framework for Ethereum with a mission to make your life a whole lot easier. 


Truffle - The most popular Ethereum development framework

web3j is a lightweight, reactive, type safe Java and Android library for integrating with clients (nodes) on the Ethereum network. This allows you to work with the Ethereum blockchain, without the additional overhead of having to write your own integration code for the platform.
<BR><BR>
<ul>
 <li>Complete implementation of Ethereum's JSON-RPC client API over HTTP and IPC </li>
 <li>Ethereum wallet support </li>
 <li>Auto-generation of Java smart contract wrappers to create, deploy, transact with and call smart contracts from native Java code </li>
 <li>Reactive-functional API for working with filters </li>
 <li>Command line tools</li>
 </ul>

web3j is a lightweight, reactive, type safe Java and Android library for integrating with clients (nodes) on the Ethereum network. This allows you to work with the Ethereum blockchain, without the additional overhead of having to write your own integration code for the platform.

web3j - Connect Java and Android apps to the Ethereum blockchain

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OpenZeppelin - A Framework to build secure smart contracts on Ethereum

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OpenZeppelin - A Framework to build secure smart contracts on Ethereum

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