Invoicing Software Open Source Image

Invoicing Software Open Source

Open source invoicing software is the next generation of invoicing solutions. Its open source source code enables developers to improve it effectively and improve user experience by adding new features like invoice tracking, reminders, stock management, online payments, real-time data export and ledger accounting. The open source invoice software provides an enterprise standard platform for business organizations to simplify business processes and make it paperless. 

  1. InvoicePlane

InvoicePlane is a self-hosted completely free invoicing software for managing your invoices, quotes, clients and payments. Open source invoicing software and was built with an intention to offer a free application for billing, invoicing, client management and payment tracking. So far the application has garnered over 12,000 users in over 150 countries. Download open source invoice software for Windows and Linux operating software.


  • Easily customizable to make sure it fits all your needs
  • Multi-lingual Interface with 23+ languages
  • Easy create an invoice with one simple click
  • CRM-like customer management making it easy for you to manage your customers
  • Easily prepare and send quotes to customers with a single click
  • Makes it easy to keep track of payments
  • Integrates well with Paypal
Invoicing Software Open Source Image

2. Simple Invoices

Simple Invoices is a free open source invoicing system that supports the recurring generation of sales reports, recurring payments, multiple customers and a variety of payment types. Install it yourself in case you need to use it or seek help from service providers supported by the developers. You can use the software to send invoices, track your finances and bill your clients. Download free invoicing software for Linux, Windows and IOS.


  • Export to various file formats: PDF, MS Word, Excel or just plain text
  • Can create multiple invoice types: Itemized invoices and total invoices
  • Offers various invoice templates to choose from
  • PayPal integration for prompt payment
  • Recurring billing
  • Invoice templates — Be able to select (or create) different layouts for your invoices
  • Unlimited invoicing
  • Efficient payment tracking
  • Can be used in various languages
Invoicing Software Open Source Image

3. F-Billing

F-billing is free billing software for service providers, businesses (small and medium-sized and freelancers. Besides, it has excellent expense tracking and cloud back up. The software enjoys a simple user-interface and is easy to create invoices. Moreover, the software supports multiple users. Download free billing software for small and medium-sized business.


  • Strong, secure yet editable products, services, and customers database
  • Let’s you easily manage your reports and invoices and print sales Comments or messages on all the reports
  • Supports use of different currency symbols in different companies or different geographical locations
  • Manage your invoices and reports. Print sales messages or comments on all invoices
  • Built-in software updater making sure you always have the most current and secure application
  • Support PDF meaning you can email your reports or invoices in PDF support
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4. Sleek Bill

Sleek Bill is top free invoice software offering top invoicing features that make it the ideal billing tool for freelancers and small businesses. The software is designed to offer the best possible user experience. Besides, it lets you create customized invoices and other necessary documents in formats of your choice — Excel or PDFs. Billing has three plans: free plan allowing a maximum of 5 invoices per month, a single computer license at $25 (with unlimited invoices) and a pro version giving you multiple computers license at $35.


  • Easily create and send estimates to your clients for review
  • Easily add or edit client details from the database
  • Automatically backs up your data to a local file where you can easily retrieve it just in case you need it
  • Allows feature to append your brand, logo and any particulars you need, to your invoice
  • The software embeds pre-loaded data for tax (you can customize it to suit your state or country)
  • Can be used by multiple companies
  • Paypal integration allows prompt payments
  • Offers smart reporting
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5. Invoice Expert

Invoice Expert is your free and open source invoicing software package for your business. The software lets you send billing estimates to your client for your approval. The software is easy to use and is usable within 5 minutes of installing. Invoice Expert free invoicing software helps organizations reduce the amount of time spent on administrative tasks as well as reduce overall invoice processing time. The Lite Edition is free to use while the Advanced Edition goes for a one-time fee of $69.95.


  • Everything comes in unlimited tag: unlimited payments, invoices, products and customers
  • The app lets you get paid faster; thanks to the seamless PayPal integration
  • Allows you to easily export data to PDF or Excel or import existing data from Excel; thanks to its inbuilt data import wizard
  • Easily customizable meaning you can append your Branding or Logo; gives a professional impression to your clients
  • Always compatible with the latest operating system
  • Gives you detailed reports regarding your earning or expenditure
  • Stable and secure cloud-based data backup
  • You can send SMS notification to your client’s when the work is done and invoices are ready for payment
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6. Invoice Ninja

InvoiceNinja is a powerful software that states invoicing as its primary function but is actually loaded with a variety of features. For an open source software, the number of functionalities it provides is commendable. With its hefty list of functionalities, InvoiceNinja ought to be your first preference when it comes to open source invoicing software.


  • Integration with over 40 payment gateway options
  • Create invoice PDFs in real-time
  • Kanban boards for project management
  • Google analytics eCommerce support
  • Professional invoice and quotation templates
  • Time tracking tools
  • Multiple company support
  • Automatic currency conversions
Invoicing Software Open Source Image

7. Invoicely

Invoicely is perfect for small businesses. It allows the user to create elegant, professional invoices in under 60 seconds. This software will take you from the estimate to the invoice in a smooth, effortless flow. Invoices created through Invoicely will allow payments from customers sitting anywhere in the world and in any currency. In fact, they can pay directly on the invoice.


  • Convenient dashboard with extensive activity log
  • Monthly and yearly financial snapshots
  • Send unlimited invoices
  • Customize invoices and set up recurring invoice accounts
  • Fully customizable statements, icons and logos for your invoices
  • Automatic payment reminders
  • Multi-business support
  • Track billable hours, expenses and miles

Never let any single minute of your hard work go uncompensated. Or, waste hours on end of productive time creating an invoice. Learn the art of intelligent delegation. And, in this case, the invoicing software can help you a great deal.


Invoicing Software Open Source – In the lead to the fact that invoicing software open source allows you to create invoices that are available online, it is very beneficial for many reasons. Looking at the top free invoice software open source, it is clear that they go above and beyond ensuring convenience and efficiency while offering a simple way to keep track of your business. Most open source invoicing software comes with a trial version so that one can test out the program before purchasing it.

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