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

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

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

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Bitcoinj - A library for working with Bitcoin

Celo - Crypto Made For Mobile

Copay - The Secure, Shared Bitcoin Wallet

Bcoin - Javascript bitcoin library for node.js and browsers

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Bitcoinj - A library for working with Bitcoin

Celo - Crypto Made For Mobile

Copay - The Secure, Shared Bitcoin Wallet

Bcoin - Javascript bitcoin library for node.js and browsers

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