Corda is an open source blockchain project, designed for business from the start. Only Corda allows you to build interoperable blockchain networks that transact in strict privacy. Corda's smart contract technology allows businesses to transact directly, with value. The smart contract can be written in Java and other JVM languages. It is a flow framework to manage communication and negotiation between participants.

Corda - Open source blockchain project, designed for business from the start

bitcoinj is a library for working with the Bitcoin protocol. It can maintain a wallet, send/receive transactions without needing a local copy of Bitcoin Core and has many other advanced features.
 
Highly optimised lightweight simplified payment verification (SPV) mode. In this mode, only a small part of the block chain is downloaded, making bitcoinj suitable for usage on constrained devices like smartphones or cheap virtual private servers.

bitcoinj is a library for working with the Bitcoin protocol. It can maintain a wallet, send/receive transactions without needing a local copy of Bitcoin Core and has many other advanced features.

Bitcoinj - A library for working with Bitcoin

Tendermint Core is Byzantine Fault Tolerant (BFT) middleware that takes a state transition machine - written in any programming language - and securely replicates it on many machines.
 
Tendermint is software for securely and consistently replicating an application on many machines. By securely, we mean that Tendermint works even if up to 1/3 of machines fail in arbitrary ways. By consistently, we mean that every non-faulty machine sees the same transaction log and computes the same state. Secure and consistent replication is a fundamental problem in distributed systems; it plays a critical role in the fault tolerance of a broad range of applications, from currencies, to elections, to infrastructure orchestration, and beyond.
 
Tendermint consists of two chief technical components: a blockchain consensus engine and a generic application interface. The consensus engine, called Tendermint Core, ensures that the same transactions are recorded on every machine in the same order. The application interface, called the Application BlockChain Interface (ABCI), enables the transactions to be processed in any programming language. Unlike other blockchain and consensus solutions, which come pre-packaged with built in state machines (like a fancy key-value store, or a quirky scripting language), developers can use Tendermint for BFT state machine replication of applications written in whatever programming language and development environment is right for them.

Tendermint Core is Byzantine Fault Tolerant (BFT) middleware that takes a state transition machine - written in any programming language - and securely replicates it on many machines.

Tendermint - Tendermint Core (BFT Consensus) in Go

Celo is a mobile-first blockchain platform that makes financial dApps and crypto payments accessible to anyone with a mobile phone. Celo enables native and non-native digital assets–both cryptographic and Central Bank Digital Currencies (CBDCs)–to circulate freely across devices, carriers, and countries. This makes money mobile, global and accessible like never before. 
 
Celo’s Proof-of-Stake (PoS) consensus mechanism and automatic daily carbon offsets make Celo the world's first carbon-negative blockchain, offsetting over 2,285 tons of carbon to-date.

Celo is a mobile-first blockchain platform that makes financial dApps and crypto payments accessible to anyone with a mobile phone. Celo enables native and non-native digital assets–both cryptographic and Central Bank Digital Currencies (CBDCs)–to circulate freely across devices, carriers, and countries. This makes money mobile, global and accessible like never before. 

Celo - Crypto Made For Mobile

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.
 
<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

Openchain is an open source distributed ledger technology. It is suited for organizations wishing to issue and manage digital assets in a robust, secure and scalable way. The administrator of an Openchain instance defines the rules of the ledger. End-users can exchange value on the ledger according to those rules. Every transaction on the ledger is digitally signed, like with Bitcoin.

Openchain - Distributed Ledger

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Corda - Open source blockchain project, designed for business from the start

Bitcoinj - A library for working with Bitcoin

Tendermint - Tendermint Core (BFT Consensus) in Go

Celo - Crypto Made For Mobile

web3j - Connect Java and Android apps to the Ethereum blockchain

Openchain - Distributed Ledger

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Projects

Corda - Open source blockchain project, designed for business from the start

Bitcoinj - A library for working with Bitcoin

Tendermint - Tendermint Core (BFT Consensus) in Go

Celo - Crypto Made For Mobile

web3j - Connect Java and Android apps to the Ethereum blockchain

Openchain - Distributed Ledger

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