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Invoicing & Payments

Browse curated open source projects in this category.

8 projects
Midday icon

Midday

Open

All-in-one tool for freelancers and small businesses to manage finances, track time, store files, and send invoices efficiently.

13/06/2026
1,757
14,576
Polar icon

Polar

Open

Comprehensive payment solution with built-in tax handling, automated benefits, and seamless integrations for digital product and SaaS businesses.

10/07/2026
741
10,045
Akaunting icon

Akaunting

Open

Cloud-based accounting software offering invoicing, expense tracking, and financial reporting for entrepreneurs and small businesses.

10/07/2026
2,952
9,944
Invoice Ninja icon

Invoice Ninja

Open

Free invoicing software for freelancers and small businesses. Create professional invoices, track expenses, accept online payments, and manage projects without hidden fees.

09/07/2026
2,670
9,877
Gumroad icon

Gumroad

Open

A digital marketplace platform where creators can sell digital products, from courses to software, with built-in payment processing and content delivery.

10/07/2026
1,969
9,387
Crater icon

Crater

Open

Crater offers AI-driven invoicing workflows, payments, and working capital tools to enhance your platform with minimal technical effort.

10/08/2024
1,695
8,316
featul icon

featul

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Frappe Books icon

Frappe Books

Open

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

28/05/2026
1,107
4,758
BillaBear icon

BillaBear

Open

BillaBear offers powerful tax management, automated workflows, and comprehensive subscription control for businesses using Stripe

22/05/2026
57
748