Best Open Source Alternatives to PayPal

Compare the best free and open-source alternatives to PayPal — self-hosted and desktop replacements you fully control, ranked by GitHub stars, license and platform support.

Curated by open-source.store · Updated August 2026 · 3 alternatives

PayPal

Proprietary SaaS

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Platformsweb, mobile

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PayPal alternatives compared

Open-source alternatives to PayPal, compared by stars, license and platform
Tool		License	Platforms	Self-hosted
Invoice Ninja	9,950	AGPL-3.0	LinuxmacOSWindowsDocker	Yes	Jul 2026	Visit
BTCPay Server	7,679	MIT	LinuxmacOSWindowsDocker	Yes	Aug 2026	Visit
Kill Bill	5,644	Apache-2.0	LinuxmacOSWindowsDocker	Yes	Jul 2026	Visit