Invoice Ninja was built to serve freelancers and business owners with a complete suite of invoicing & payment tools to advance your business. Instead of using Word documents, nondescript PayPal forms, or overpriced software, with Invoice Ninja you can send beautiful branded invoices with minimum of effort and maximum professionalism.

InvoiceNinja - Invoices, Expenses, Tasks and Proposals built with Laravel

Omnipay is a payment processing library for PHP. It has been designed based on ideas from Active Merchant, plus experience implementing dozens of gateways for CI Merchant. It has a clear and consistent API, is fully unit tested, and even comes with an example application to get you started.

OmniPay - A framework agnostic, multi-gateway payment processing library for PHP 5.3+

Hyperswitch is an open source payments switch to make payments fast, reliable, and, affordable. It lets you connect with multiple payment processors and route traffic effortlessly, all with a single API integration.
Hyperswitch reduces the dependency on a single processor like Stripe or Braintree. It actually supports more than 50+ payment processors and multiple global payment methods. It unifies the payment processing and reduces the dev effort. It has high success rate and it reduces the processing fees using smart routing. Most importantly it mproves success rates by handling failover and auto-retries.
Hyperswitch hosted version has PCI, GDPR, Card Vault complaince. If we need to use the open source version then we need to take this compliance.&nbsp;&nbsp;

Hyperswitch is an open source payments switch to make payments fast, reliable, and, affordable. It lets you connect with multiple payment processors and route traffic effortlessly, all with a single API integration.

Hyperswitch - Open-source Payments Switch

Kill Bill is the open-source subscription billing and payments platform. It supports Subscription engine, with plans management (trial, upgrade, downgrade, etc.), support of add-ons, bundles with multiple subscriptions, Invoicing engine, supporting different billing alignments, recurring and one-time charges, international tax, metered billing, Payment state machine, with payment routing capabilities, supporting dozen of gateways and lot more.

Kill Bill - Open-Source Subscription Billing & Payment Platform

Cyclos is an Online and Mobile banking software. It is highly customizable and Ideal for banks, barters, remittances and complementary currency systems. Over 1500 payment systems worldwide use Cyclos. The Cyclos platform permits a de-centralization of banking services that can stimulate local trade and development.
 
It has long list of features which include Banking payments, Multiple currencies, Loans, Savings account, User management, Account management like viewing account balance, account summary, payment history etc.

Cyclos is an Online and Mobile banking software. It is highly customizable and Ideal for banks, barters, remittances and complementary currency systems. Over 1500 payment systems worldwide use Cyclos. The Cyclos platform permits a de-centralization of banking services that can stimulate local trade and development.

Cyclos - Online and Mobile Banking Software

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

Akaunting is a free and online accounting software designed for small businesses to manage their finances and stay on top of their cash flow. Invoicing, accepting online payments and keeping track of expenses couldn't be simpler.
 
Its feature include Customer Management, Easy Invoicing, Deposit and Transfer, Vendor Management, Multi Currency, Multilingual Panel, Discount.

Akaunting is a free and online accounting software designed for small businesses to manage their finances and stay on top of their cash flow. Invoicing, accepting online payments and keeping track of expenses couldn't be simpler.



Akaunting - Accounting Software built on Laravel

Taler is a new electronic payment system. When you pay with Taler, your identity does not have to be revealed to the merchant. The bank, government and exchange will also never learn how you spent your electronic money. However, you can prove that you paid in court if necessary.
 
Taler uses an electronic exchange holding financial reserves in existing currencies. This means that Taler is not a new currency with the inherent currency fluctuation risks, but instead the cryptographic coins correspond to existing currencies, such as US Dollars, Euros or even BitCoins.

Taler is a new electronic payment system. When you pay with Taler, your identity does not have to be revealed to the merchant. The bank, government and exchange will also never learn how you spent your electronic money. However, you can prove that you paid in court if necessary.

Taler - Electronic payments for a liberal society

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.

A revolutionary cloud accounting platform designed for small and medium businesses. It solves the problem by making it easy to record payments from multiple customers in one deposit and, conversely, easily recording vendor invoice payments with a single check. Its extensive API enables automatic creation of customers, vendors, sales orders, purchase orders, invoices and more. 


BeansBooks - Cloud Accounting Platform

BillRun is a NoSQL billing solution built for Big-Data.  BillRun was designed under the perception that billing architecture should fit the complexity of Big-Data, not the other way around. It is tailored for enterprises with complex Big-Data, hence ideal for telecos, large eCommece/mCommerce sites, insurance companies, and just about any organization that copes with ever-growing diverse sets of data on a daily, hourly and real-time basis. 

BillRun - Open Source Billing and Fraud System

Stellar is a decentralized, hybrid blockchain that is fully open-source. It is infrastructure that exists to facilitate cross-asset transfers of value, including payments. With just one integration into the Stellar Network, you will join an open, global financial network where all actors – be they people, payment networks, or banks – have equal access & economic participation. 

Stellar - Move Money Across Borders Quickly, Reliably, And For A Fraction Of A Penny.

ServiceBot is a platform for a business to sell their services and automate the administrative tasks such as billing and invoicing. Create an online store for your subscription-box service, web design agency, photography business and much more! Start selling your services online within minutes.

Servicebot - Open source service automation platform

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