Ethereum is a decentralized platform that runs smart contracts: applications that run exactly as programmed without any possibility of downtime, censorship, fraud or third party interference. These apps run on a custom built blockchain, an enormously powerful shared global infrastructure that can move value around and represent the ownership of property. 
 
This enables developers to create markets, store registries of debts or promises, move funds in accordance with instructions given long in the past (like a will or a futures contract) and many other things that have not been invented yet, all without a middle man or counterparty risk.
 
It allows you to hold and secure ether and other crypto-assets built on Ethereum, as well as write, deploy and use smart contracts. It helps you to design your own currency.

Ethereum is a  decentralized platform that runs smart contracts: applications that run exactly as programmed without any possibility of downtime, censorship, fraud or third party interference. These apps run on a custom built  blockchain, an enormously powerful shared global infrastructure that can move value around and represent the ownership of property. 

Ethereum - Blockchain APP Platform

Bitcoin uses peer-to-peer technology to operate with no central authority or banks; managing transactions and the issuing of bitcoins is carried out collectively by the network. Bitcoin is open-source; its design is public, nobody owns or controls Bitcoin and everyone can take part. Through many of its unique properties, Bitcoin allows exciting uses that could not be covered by any previous payment system.

Bitcoin - Most popular Crypto Currency

CCXT – CryptoCurrency eXchange Trading Library. A JavaScript / Python / PHP library for cryptocurrency trading and e-commerce with support for many bitcoin/ether/altcoin exchange markets and merchant APIs. The CCXT library is used to connect and trade with cryptocurrency / altcoin exchanges and payment processing services worldwide. It provides quick access to market data for storage, analysis, visualization, indicator development, algorithmic trading, strategy backtesting, bot programming, webshop integration and related software engineering.

CCXT - A JavaScript / Python / PHP cryptocurrency trading library with support for more than 100 bitcoin/altcoin exchanges

Litecoin is an experimental digital currency that enables instant payments to anyone, anywhere in the world. Litecoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Litecoin Core is the name of open source software which enables the use of this currency.
 
The Litecoin blockchain is capable of handling higher transaction volume than its counterpart - Bitcoin. Due to more frequent block generation, the network supports more transactions without a need to modify the software in the future.

Litecoin is an experimental digital currency that enables instant payments to anyone, anywhere in the world. Litecoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Litecoin Core is the name of open source software which enables the use of this currency.

Litecoin - Global Decentralized Currency

A simplified blockchain implementation in Golang

blockchain_go - A simplified blockchain implementation in Golang

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

Ripple is a network of computers which use the Ripple consensus algorithm to atomically settle and record transactions on a secure distributed database, the Ripple Consensus Ledger (RCL). Because of its distributed nature, the RCL offers transaction immutability without a central operator. The RCL contains a built-in currency exchange and its path-finding algorithm finds competitive exchange rates across order books and currency pairs.
 
Ripple enables banks to settle cross-border payments in real-time, with end-to-end transparency, and at lower costs. Banks can provide liquidity for FX themselves or source it from third parties. As Ripple adoption grows, so do the number of currencies and counterparties. Liquidity providers need to maintain accounts with each counterparty for each currency – a capital- and time-intensive endeavor that spreads liquidity thin. Further, some transactions, such as exotic currency trades, will require multiple trading parties, who each layer costs to the transaction. Thin liquidity and many intermediary trading parties make competitive pricing challenging.

Ripple is a network of computers which use the Ripple consensus algorithm to atomically settle and record transactions on a secure distributed database, the Ripple Consensus Ledger (RCL). Because of its distributed nature, the RCL offers transaction immutability without a central operator. The RCL contains a built-in currency exchange and its path-finding algorithm finds competitive exchange rates across order books and currency pairs.

Rippled - Decentralized cryptocurrency blockchain daemon implementing the XRP Ledger in C++

Zcash is an implementation of the "Zerocash" protocol. Based on Bitcoin's code, it intends to offer a far higher standard of privacy through a sophisticated zero-knowledge proving scheme that preserves confidentiality of transaction metadata. Bitcoin and most cryptocurrencies expose your entire payment history to the public. Zcash is the first open, permissionless cryptocurrency that can fully protect the privacy of transactions using zero-knowledge cryptography.
 
 Zcash also enables users to send public payments which work similarly to Bitcoin. With the support for both shielded and transparent addresses, users can choose to send Zcash privately or publicly. Zcash payments sent from a shielded address to a transparent address reveal the received balance, while payments from a transparent address to a shielded address protect the receiving value.

Zcash is an implementation of the "Zerocash" protocol. Based on Bitcoin's code, it intends to offer a far higher standard of privacy through a sophisticated zero-knowledge proving scheme that preserves confidentiality of transaction metadata. Bitcoin and most cryptocurrencies expose your entire payment history to the public. Zcash is the first open, permissionless cryptocurrency that can fully protect the privacy of transactions using zero-knowledge cryptography.

Zcash - Internet Money

BTCPay Server is a self-hosted, open-source cryptocurrency payment processor, which allows you to accept bitcoin without fees or intermediaries.. It's secure, private, censorship-resistant and free. 
 
Features: 
<ul>
<li>Direct, peer-to-peer Bitcoin payments</li>
<li>No transaction fees (other than the <a href="https://en.bitcoin.it/wiki/Miner_fees" rel="nofollow">network fee</a>)</li>
<li>No fees, middleman or KYC</li>
<li>Non-custodial (complete control over the private key)</li>
<li>Enhanced privacy &amp; security</li>
<li>Self-hosted</li>
<li>SegWit support</li>
<li>Lightning Network support (LND, c-lightning, Eclair, and Ptarmigan)</li>
<li>Tor support</li>
<li>Share your instance with friends (multi-tenant)</li>
<li>Invoice management and Payment requests</li>
<li>Apps: Point of sale, crowdfunding, donation button</li>
<li>Full-node reliant wallet with <a href="https://docs.btcpayserver.org/Vault/" rel="nofollow">hardware wallet integration</a> and SegWit support</li>
<li>Bitcoin-only build, separate community-maintained altcoin build (<a href="https://docs.btcpayserver.org/FAQ/FAQ-Altcoin/" rel="nofollow">supported altcoins</a>)</li>
</ul>

BTCPay Server is a self-hosted, open-source cryptocurrency payment processor, which allows you to accept bitcoin without fees or intermediaries.. It's secure, private, censorship-resistant and free. 



BTCPay Server - Accept Bitcoin payments

Cardano SL (or Cardano Settlement Layer) is a cryptographic currency designed and developed by IOHK in conjunction with the University of Edinburgh, the University of Athens and the University of Connecticut. Cardano SL is based on the Haskell implementation of the white paper "Ouroboros: A Provably Secure Proof-of-Stake Blockchain Protocol" by Aggelos Kiayias, Alexander Russell, Bernardo David and Roman Oliynykov.



cardano-sl - Cryptographic currency implementing Ouroboros PoS protocol

Square stores a reserve of Bitcoins in an offline setting. By having these funds offline, it reduces attack surface and risk of theft. Square's solution is unique, specifically, it leverages FIPS certified Hardware Security Modules (HSMs) to protect the private key material. Funds can be sent from online systems to the cold storage at any time. Moving funds out of cold storage requires a multi-party signing ceremony.

SubZero - Square's Bitcoin Cold Storage solution

Waves is an open-source blockchain platform, that allows users to launch their own custom cryptocurrency tokens. Whilst popular cryptocurrencies such as Bitcoin and Ethereum can be traded on external exchanges, and Ethereum allows users to create new tokens on the platform using a smart contract, Waves includes this functionality in its core software and wallet. Users can create, transfer and exchange blockchain tokens on a peer-to-peer basis, paying transaction fees in the native WAVES token.
 
Waves platform helps you to transfer funds from person to person, Take advantage of our platform’s outstanding security, Receive interest on your Waves account balance

Waves is an open-source blockchain platform, that allows users to launch their own custom cryptocurrency tokens. Whilst popular cryptocurrencies such as Bitcoin and Ethereum can be traded on external exchanges, and Ethereum allows users to create new tokens on the platform using a smart contract, Waves includes this functionality in its core software and wallet. Users can create, transfer and exchange blockchain tokens on a peer-to-peer basis, paying transaction fees in the native WAVES token.

Waves - Blockchain platform

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)

Vertcoin is a digital currency that can be sent between people over the internet. Vertcoin (VTC) stays true to the original vision of cryptocurrency: a financial system owned by its users, the people’s coin. Vertcoin is not controlled by large banks or mining hardware manufacturers and can be mined by anyone profitably. Fairly distributed without a premine, ICO or airdrop, Vertcoin is developed by community members working as volunteers and the project is wholly funded by donations. A finite resource similar to gold, you can rest assured that Vertcoin will keep your money safe from vested interests and ensure that transaction fees are proportionate and shared between a large number of miners. With Vertcoin, you can truly be your own bank.



Vertcoin - Decentralized currency owned by its users

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