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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.

07/05/2026
1,468
14,249
Polar icon

Polar

Open

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

15/05/2026
715
9,848
Akaunting icon

Akaunting

Open

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

15/05/2026
2,913
9,802
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.

16/05/2026
2,636
9,736
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.

16/05/2026
1,917
9,081
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
1,688
8,284
featul icon

featul

Ad

Collect feedback, plan with roadmaps, and share updates all in a simple, privacy-first platform.

Visit featul
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.

10/04/2026
1,079
4,637
BillaBear icon

BillaBear

Open

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

08/05/2026
53
747