Open Source Subscription Management
This category splits two ways, and both turn on losing track of recurring money: one side helps a person see every subscription quietly draining their card, the other is billing infrastructure that charges customers on a recurring or usage-based meter. The open source options here serve both ends without becoming yet another subscription - the personal trackers run on your own machine, and the billing engines let you own the pricing logic and invoicing instead of renting it.
Lago
Open-source billing infrastructure for usage-based, subscription-based, and hybrid pricing models
Wallos
Self-hostable personal subscription tracker for recurring payments, budgets, and multi-currency expenses
Kill Bill
Open-source subscription billing and payments platform with real-time analytics and financial reports
Flexprice
Open-source billing infrastructure for usage-based, credit-based, and hybrid pricing
Open Collective
Online funding platform for open communities to raise money and share finances transparently
OpenMeter
Open-source metering and billing platform for usage-based AI, API, and DevTool monetization
SubTrackr
Self-hosted subscription tracker with spending analytics, reminders, and export options
UniBee
Open-source billing software for SaaS subscriptions, invoices, transactions, and recurring payments