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Open Source Billing and Invoicing Software (2026)
Last updated: February 2026
31 software options
Sponsored
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
All-in-one open-source business software
Odoo offers flexible pricing plans to accommodate various business needs. The One App Free plan allows one app and unlimited users for free. The Standard plan starts at $31.10 per user per month (billed annually) and offers all apps. The Custom plan starts at $61.00 per user per month (billed annually) and includes Odoo Studio, Multi-Company, and an External API.
Read more about Odoo
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Be more professional, profitable, efficient, and organized.
Plans start at $450/month and scale with your team size and tools. Add features like texting customers right from the app for even more power. Want to give it a go? Try JobNimbus free for 14 days—no credit card required.
Read more about JobNimbus
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
More than Invoicing. Powerful Apps to Run Your Business!
Forever Free Ninja Pro: $10/month Enterprise: $14/month - $44/month
Read more about Invoice Ninja
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
One platform to streamline your entire business
Read more about Bonsai
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Solutions for On-line businesses
Free if installed "On premise". From 9 euros / month with a Saas provider
Read more about Dolibarr
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Invoice Software for Small Businesses
Pricing is available on monthly as well as annual subscriptions. You can get upto 58% discount from the pricing page. Monthly subscriptions start at $2.99 per month for a single company and $14.99 per month for unlimited companies. Yearly subscriptions start at $1.25 per month for a single company and $12.50 per month for unlimited companies. 2 yearly and 3 yearly plans are also available.
Read more about Moon Invoice
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Cloud-based ERP solution for small to midsize businesses
Community plan: free Pro: 35€/month/user Entreprise Pro: Discuss your project Contact Axelor for more information.
Read more about Axelor
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Texada: Your Partner for Smarter Equipment Management
Pricing information is available on inquiry.
Read more about Texada
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Cloud Accounting Software for Business
Core: £10 per month Line of Business: £25 per month Pro: £50 per month Enterprise: £70 per month Additional services available.
Read more about Aqilla
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Open Source Subscription Billing and Payment Platform
Kill Bill is free, open-source software (Apache V2 license).
Read more about Kill Bill
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Growth Made Easy
Pricing starts from IDR 399,000 for the Pro version. There are three pricing packages: Pro, Enterprise, and Enterprise+.
Read more about Mekari Jurnal
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Open source ERP software for small business
Services, plugins and courses are subject to paiement.
Read more about FacturaScripts
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Automate Collections and get paid faster.
Starting from $89/month (AUD, NZD, USD)
Read more about CreditorWatch Collect
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Subscription management, recurring billing and payments
Frisbii Subscription Management starts from €49/month. Frisbii Payment Gateway standalone from €19/month + 0,08 cent processing fee + payment method fee Contact us to know more.
Read more about Frisbii
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Your Business Financial Operations Simplified
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Timesheet Tracking Solutions for the Project Workforce
Prices range from $6.00 to $16.00 per user, per month.
Read more about Upland Timesheet
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Simplifying Invoices, Amplifying Success
Free trial. Paid version starts from ₹99/month
Read more about NextBill
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Web-based Business Management Software
Read more about Stack360
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Stop selling product. Start selling recurring services.
Community edition can be downloaded/installed for free.
Read more about Opencell
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
License-free business software: customizable & updatable
metasfresh ERP gives you the maximum freedom of choice by letting you pick the way you want to run, host, support and extend your own ERP system. You can either self-host and self-support it, pick a hosting option from us or have a professional partner deliver you a turnkey solution. It's your choice – because it's your ERP! Self-Hosted: FREE forever (All Features + Releases). Cloud-Hosted: €24/month per user* (All features, cloud-hosted, regular releases, automatic updates, enterprise support). *Price plus VAT. Subscriptions can be cancelled on a monthly basis.
Read more about metasfresh
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Order to Billing
Please contact us for pricing.
Read more about O2B
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Job costing, invoicing, and construction management software
Cyanic Job Book offers a free trial for 90 days. Paid plans include monthly subscriptions starting from $10 per user per month.
Read more about Cyanic Job Book
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
The lead solution in Training, Consulting and 24/7 Support.
Read more about Unbox ERP
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Subscription+Usage Billing Automation system - SaaS/OnPrem
SaaS - starts @ USD499.00 per month billed annually for upto 10000 customers. Next 2 slabs at upto 25000 customer and higher than 25000. On Premise - Please contact us.
Read more about Simple Billing
SnapBill has four main packages available: Free: Manage less than 5 clients and send up to 15 invoices per month. Startup: Billing automation of up to 50 clients. Includes support for many popular payment gateways. Premium: Billing automation of up to 500 clients. Includes support for many popular payment gateways. Enterprise: This package is the most fully featured and has no limits. Only a per client fee per month is applicable. Custom modules are available.
Read more about SnapBill