Accounting software enables companies for managing finances and keeps tracking of estimates, invoices, expenses, time tracking, and payment handling.

Top 5 Open Source Accounting Software In the Year 2021

Accounting software is one of the first and most critical application for any business. The right accounting system would help you to keep track of your company’s money going in and out. We have compiled a list of the top 5 free and open source accounting software and cover them in this blog post.


InvoiceNinja is one of the popular and modern open source accounting software. It’s 100% free and a self-hosted accounting system. However, you can use it as (SaaS) software as a Service by choosing a subscription plan. InvoiceNinja has impressive features such as invoices, payment handling, vendors, expenses, tasks, projects, and many more. In addition, InvoiceNinja provides beautiful mobile applications for iPhone and Android devices. This open source invoicing software is PHP Laravel framework source code is available at GitHub.

Here is a list of the key feature for InvoiceNinja:

  • Create and Email Invoices/Quotes in Real-Time
  • 40+ Payment Gateway Integration Options
  • Multiple Company Support
  • Create Recurring Invoicing & Auto-Bill Clients
  • Proposals Creation Tool

Learn more about InvoiceNinja


Akaunting is another one of the top open source accounting software based on the PHP Laravel framework. It provides out of the box beautiful interfaces for desktop, mobile, and tablet. Akaunting comes with excellent features that fulfill the financial need of any business. Moreover, you can setup it on your private server and keep control of all the important data. Its source code is available on GitHub.

Following are the key features of Akaunting:

  • Customer Management
  • Beautiful Interface
  • Mobile & Tablet Ready Interface
  • 100% Financial Data Ownership
  • Lifetime FREE Updates

Learn more about Akaunting


InvoicePlane is free and self-hosted accounting software. It offers out of the box CRM (customer relationship management) module. CRM feature enables the business to manage the key information of customers. You can easily create tasks such as quotations, invoices, receipts, and payments. InvoicePlane supports several payment methods for financial transactions. Moreover, it supports multilingual and you can run it in the language of your choice. However, InvoicePlane is written in PHP CodeIgniter framework and all of its source code is available on GitHub.

InvoicePlane offers the following key points:

  • Quotes, Invoices, Payments
  • Recurring invoices
  • Manage your Clients
  • Customize easily
  • One-Click Online Payments

Learn more about InvoicePlane

Kill Bill

Kill Bill is one of the best open source accounting software based on Java. It is a robust, scalable, and customizable invoicing system. It has impressive feature set that can be used to handle all the financial operations. Further, Kill Bill supports plugins, and you can either use available plugins or create your own for enhancing the system. Moreover, it offers an API that enables businesses to do the integration with third-party services. It’s source code is available on GitHub.

Kill Bill comes up with the following key features:

  • Financial analysis
  • History tracking
  • Invoice management
  • Real time analytics
  • Real time notifications

Learn more about Kill Bill


Crater is open source accounting software. It is 100% free and ideal for freelancers and small businesses. Crater has some great features such as invoice handling, estimates, track expenses, and payments. Further, Crater offers out of the box mobile applications for Android and iPhone devices. This open source invoice management system is written in the PHP Laravel framework. Moreover, its source code is available on GitHub with a complete development roadmap.

Crater supports the following important features:

  • Invoices management
  • Payment tracking
  • Extensive Reporting
  • Support Tax Handling
  • Mobile application for Android and iPhone

Learn more about Crater


We have discussed the top 5 free and open source accounting software in this tutorial. All have a great number of features and are widely used by many businesses. You can review this blog post thoroughly and relevant links. It would also help you to choose the right accounting software for your business.

Further, is on the way to enhance the stack of open source products in multiple languages and frameworks. For regular updates, please stay tuned at Invoicing category for more interesting articles.


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