Top Open Source Invoicing & Payments Tools in 2026
A curated collection of the 16 best free and open-source Invoicing & Payments tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.
SolidTime
Open source time tracker for teams
Stars8,883Last commit11d agoLicenseAGPL-3.0
TimeScribe
Private offline time tracker for macOS and Windows
Stars889Last commit3mo agoLicenseGPL-3.0
Sure.am
Open-source personal finance tracker
Stars9,626Last commit10d agoLicenseAGPL-3.0
Financial Freedom
Open source budgeting tool for privacy-focused wealth building
Stars2,918Last commit3mo agoLicenseGPL-3.0
Polar
Billing platform for AI-era software with global tax handling
Stars10,213Last commit10d agoLicenseApache-2.0Odoo
Open source ERP and CRM suite
Stars53,981Last commit10d agoLicenseOpen SourceMonetr
Open source paycheck-by-paycheck budgeting app
Stars679Last commit14d agoLicenseOpen SourceMidday
All-in-one business stack for modern founders
Stars14,927Last commit2mo agoLicenseAGPL-3.0
Maybe
Open source personal finance app
Stars54,314Last commit13mo agoLicenseAGPL-3.0Invoice Ninja
Free invoicing software for freelancers and small businesses. Create professional invoices, track expenses, accept online payments, and manage projects without hidden fees.
Stars10,030Last commit26d agoLicenseOpen SourceGumroad
A digital marketplace platform where creators can sell digital products, from courses to software, with built-in payment processing and content delivery.
Stars9,622Last commit10d agoLicenseMITFrappe Books
Free open-source desktop accounting software
Stars4,904Last commit6mo agoLicenseAGPL-3.0Crater
Embedded AR/AP automation for fintech platforms
Stars8,341Last commit43mo agoLicenseAGPL-3.0
Marble
AI-powered fraud & AML compliance platform
Stars587Last commit13d agoLicenseOpen Source
Akaunting
Open-source accounting software for small businesses
Stars10,094Last commit11d agoLicenseOpen Source
