Best Indie Invoicing & Billing Tools in 2026

Free invoicing, expenses, and time-tracking for freelancers

Simple invoicing REST API — send JSON, get a PDF

Zero-maintenance invoicing that generates beautiful invoices automatically

A Python-based tool to generate professional invoices and quotations with PDF export, MySQL storage,

CodeIgniter 4 Auto API Generator - Instantly create production-ready RESTful APIs from your database

Open-source metering and usage-based billing.

Open-source invoicing app for freelancers.

Open-source HR management software for growing teams.

Open-source ERP with full HR and payroll modules.

Open-source accounting software for small businesses.

Open-source ERP with accounting, inventory, and HR modules.

Open-source invoicing application for freelancers.

StockTrack is a lightweight, self-hosted inventory management system built with HTML, PHP, and SQLit

A self-hosted open-source application built with CodeIgniter and Bootstrap. Features include electro

An invoice generator app built using Next.js, Typescript, and Shadcn

💵 Independent financial accounting with intelligent reporting, alternative to Quickbooks, Xero, Wave

Self-hosted AI accounting app. LLM analyzer for receipts, invoices, transactions with custom prompts

Extract structured data from PDF invoices

Smooth photo display and management app

Super simple PDF invoicing library for Ruby

Image hosting and sharing software

Self-hosted invoicing without the bloat.

Invoicerr is a freelance-focused invoicing app that lets you create quotes, generate invoices, track

Create and manage invoices in your browser. Serverless Invoices is a free invoicing tool for freelan

Blazing fast, content-based search for visited websites

Python lib for Factur-X, the e-invoicing standard for France and Germany

Invoice and quotation builder desktop app with PDF export, designed for small businesses and freelan

Fab-Manager is the FabLab management solution. It provides a comprehensive, web-based, open-source

Swiss QR Bill generation for Node.js and browsers

Swiss army knife of code time tracking

Generate beautiful invoices from simple Typst or YAML data records

🇪🇺 💶 Generate e-invoices (E-Rechnung in German) conforming to EN16931 (Factur-X/ZUGFeRD, UBL, CII, X

Manage Factur-X and ZUGFeRD 2.0 PDF invoices in PHP

PDF invoice generator for .NET Core. Create invoices easily, including example CLI.

Tool for creating account credentials for multiple services via JSON

Python tool to machine read shopping receipt from Lidl Switzerland

See your freelance income and workload before it happens

Popular e-commerce module for Drupal CMS, with support for dozens of payment, shipping, and shopping related modules

Free Accounting Software

Personal finance app for everyone

Automate expense reporting, reimbursements, and corporate card management with real-time data sync and powerful integrations.

Web-based multi-user time-tracking application

A user-friendly desktop accounting software that helps businesses manage invoices, track expenses, and handle bookkeeping with a modern interface.

Open Source Point of Sale is a web based point of sale system

A flexible billing platform that handles usage-based metering, credit management, and subscription billing, giving developers full control over pricing models.

Local image compression in the browser

Simplify Stripe integration for AI startups with 3 functions, 0 webhooks. Build pricing plans in 30 minutes with usage tracking, credits, and feature controls.

File indexer, search engine, and data management platform

Web-based time-tracking solution

AI-powered image background removal