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Update 26/06/2019: This post has been updated with the latest popular Free and Open Source Invoicing and Billing Software for businesses.

Are you are a freelancer or proprietor of a small to a medium-sized enterprise? If so, then you must be putting up a lot of work into your business. Every hour spent on your hard work counts and no part of a job is so small to go uncompensated. However, getting paid means you have to send your client an invoice. And, that means you need super free open source billing software.

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Why do you need invoicing software?

I’m sure you are questioning the rationale behind this invoicing and billing software at the back of your mind. Well, to make things a bit clearer, you need to whip up something that has a professional appeal. You can prepare a simple document with your word processor or a spreadsheet. But, you need an application that can keep track of your payment and reminds you to follow up on the invoices you have already sent which can be provided by the invoice and billing software. So, hope that you understood the importance of invoicing software.

Top 10 Free and Open Source Invoicing Software and Billing Software

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.

Features

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

It is free.

Also read: Invoicing Tips for Small Businesses

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.

Features

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

Pricing

Free Plan

Solo : $29 (single computer license)

Pro: $39 (multiple computer license)

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.

Features

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

Pricing

Offline Free

Offline Premium: 1999 INR per year

Offline Premium + Inventory: 3199 INR per year

Online Premium: 1999 INR per year

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.

Features

Everything comes in the 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 an SMS notification to your client’s when the work is done and invoices are ready for payment

Pricing

Lite Edition: Free

Advanced Edition: $69.95

InvoiceNinja is a powerful software that states invoicing as its primary function but is actually loaded with a variety of features. For 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.

Features

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

Pricing

Free plan

Ninja Pro Plan: $8 per month

Enterprise Plan: Starting from $12 per month

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.

Features

Convenient dashboard with an 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

Pricing

Free Plan

Basic Plan: $9.99 per month

Professional Plan: $19.99 per month

Enterprise Plan: $29.99 per month

7. InvoicePlane

InvoicePlane is a self-hosted completely free invoicing software for use application for managing your invoices, quotes, clients and payments. Open source invoicing software and was built with the 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 the software.

Features

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

It is free.

8. BambooInvoice

If you are an independent contractor, BambooInvoice is one of the best free, open-source invoicing software. In fact, it can also be used by small businesses. What sets it apart is its simplicity to use. Its intuitive interface allows a non-tech savvy person to easily access the system.

Furthermore, you can create and edit invoices while also keeping track of them by client or invoice numbers you assign. It notifies you about the pending invoices. If that wasn’t enough, you can also email the invoices from within the application or generate PDFs.

Features

Available in more than 11 languages, including French, English, Dutch, Spanish, German, Romanian, Swedish, Portuguese, Bulgarian, Italian, and Estonian. Plus, new languages are being added all the time

Extremely easy-to-use and actively used software programs amongst the users

Built on modern coding standards to keep things functional

Works with all modern and standard compliant web browsers

It is free.

9. Boxbilling

Boxbilling is another free and open source billing and client management software. It offers tons of pre-designed templates for billing, and it also gives you the option to customize it as per your preferences. The best part is even though it allows you to create an invoice in multiple currencies, you can calculate profits in your own currency.

In short, it automates billing, invoicing, and product provisioning. The order automatically gets suspended if the payment is not received till the due date. Apart from that, it is powered by Intuitive Web 2.0 AJAX interface with 100% usability score.

Features

Allows you to accept one-time and recurring payments in multiple currencies

Enables selling of shared and reseller hosting accounts, software licenses, downloadable products or any recurrent billing product

You can configure the system to send payment reminders until the order is terminated or late payment is collected

Facilitates integrated helpdesk to communicate with clients easily

Pricing

Free license

Pro license: $5.95 per month

The last on our list in jBilling — an open source billing software that gives you full access to the code. You can customize the code to suit your business needs. Specially designed for small- to medium-level enterprises and agencies, it supports windows and web app platforms.

Moving on, jBilling gives you full control over how your invoices are calculated and presented. This helps you perfect your customer touchpoint. Plus, its template generator feature lets you design every element of your invoices. You can maintain any number of formats, and easily update them from the user interface.

Features

Facilitates accurate invoicing, customized invoice presentation, and flexible invoice delivery

Deployable on the cloud platform on-premises basis; designed for enterprise-level grade

Supports multiple currencies and internationalized language support

Automates the tiring task of collecting payments from your customers

Pricing

Quote by request to vendor

Bottom Line

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.