The best open source alternative to WHMCS is Autumn. If that doesn't suit you, our users have ranked more than 25 alternatives to WHMCS and nine of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to WHMCS are BoxBilling, Paymenter, FOSSBilling and Kill Bill.
Autumn is an open-source layer between Stripe and your application, allowing you to create any pricing model and embed it with a couple lines of code. On Autumn you can build:
Completely free and open source billing and support software. Works as an open source alternative to WHMCS, all for free with no strings attached.
Automate subscriptions, eliminate billing chaos, and grow your hosting business – without vendor lock-ins or hidden costs.
Empower your hosting business with FOSSBilling, the free and open-source solution for efficient billing and client management.
Kill Bill can fulfill the billing and payment needs of nearly any online business. Reliable and robust, it has proven itself over time with even the largest SaaS and e-commerce organizations.
MythicalDash is an open-source, user-friendly client area for managing servers on platforms like Pterodactyl and Plesk. It simplifies server management with a secure and feature-rich interface.
CLOUD BILLING & AUTOMATION A next Generation Billing & Automation software for Hosters and Telcos, Billia makes for an easier management of your company and services.
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Have similar functionality and design with whmcs