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

Bitcore is a infrastructure to build Bitcoin and blockchain-based applications for the next generation of financial technology. It is a full bitcoin node, your apps run directly on the peer-to-peer network. For wallet application development, additional indexes have been added into Bitcoin for querying address balances, transaction history, and unspent outputs.

bitcore - A full stack for bitcoin and blockchain-based applications

A simplified blockchain implementation in Golang

blockchain_go - A simplified blockchain implementation in Golang

The Lightning Network Daemon (lnd) - is a complete implementation of a Lightning Network node and currently deployed on testnet3 - the Bitcoin Test Network. lnd has several pluggable back-end chain services including btcd (a full-node) and neutrino (a new experimental light client). The project's codebase uses the btcsuite set of Bitcoin libraries, and also exports a large set of isolated re-usable Lightning Network related libraries within it. 



lnd - Lightning Network Daemon

Bit is Python's fastest Bitcoin library and was designed from the beginning to feel intuitive, be effortless to use, and have readable source code. 
 
Its features include: 
<ul>
<li>Python's fastest available implementation (100x faster than closest library)</li>
<li>Seamless integration with existing server setups</li>
<li>Supports keys in cold storage</li>
<li>Fully supports 25 different currencies</li>
<li>First class support for storing data in the blockchain</li>
<li>Deterministic signatures via RFC 6979</li>
<li>Access to the blockchain (and testnet chain) through multiple APIs for redundancy</li>
<li>Exchange rate API, with optional caching</li>
<li>Optimal transaction fee API, with optional caching</li>
<li>Compressed public keys by default</li>
<li>Multiple representations of private keys; WIF, PEM, DER, etc.</li>
<li>Standard P2PKH transactions</li>
</ul>

Bit is Python's fastest Bitcoin library and was designed from the beginning to feel intuitive, be effortless to use, and have readable source code. 

Bit - Bitcoin made easy.

Copay is a secure bitcoin wallet platform for both desktop and mobile devices. The Copay app securely stores multiple, distinct bitcoin wallets, allowing both business and privacy-conscious users to keep funds carefully separated. It makes sharing a wallet simple and secure. It is one of the first bitcoin wallets to support the full Bitcoin Payment Protocol (BIP 0070-0073). 
 
When you send money to a Payment Protocol-enabled merchant, Copay securely verifies that your payment will go to the right place. It has support for over 150 currency pricing options and unit denomination in BTC or bits.

Copay is a secure bitcoin wallet platform for both desktop and mobile devices. The Copay app securely stores multiple, distinct bitcoin wallets, allowing both business and privacy-conscious users to keep funds carefully separated. It makes sharing a wallet simple and secure. It is one of the first bitcoin wallets to support the full Bitcoin Payment Protocol (BIP 0070-0073). 

Copay - The Secure, Shared Bitcoin Wallet

Bcoin is an alternative implementation of the bitcoin protocol, written in node.js. Although still in a beta state, bcoin is well tested and aware of all known consensus rules. It is currently used in production as the consensus backend and wallet system for purse.io.

Bcoin - Javascript bitcoin library for node.js and browsers

btcd is an alternative full node bitcoin implementation written in Go (golang).This project is currently under active development and is in a Beta state. It is extremely stable and has been in production use since October 2013.
 
It properly downloads, validates, and serves the block chain using the exact rules (including consensus bugs) for block acceptance as Bitcoin Core. We have taken great care to avoid btcd causing a fork to the block chain. It includes a full block validation testing framework which contains all of the 'official' block acceptance tests (and some additional ones) that is run on every pull request to help ensure it properly follows consensus. Also, it passes all of the JSON test data in the Bitcoin Core code.
 
One key difference between btcd and Bitcoin Core is that btcd does NOT include wallet functionality and this was a very intentional design decision.This means you can't actually make or receive payments directly with btcd. That functionality is provided by the btcwallet.

btcd is an alternative full node bitcoin implementation written in Go (golang).This project is currently under active development and is in a Beta state. It is extremely stable and has been in production use since October 2013.

btcd - An alternative full node bitcoin implementation written in Go (golang)

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