FlossPay

The Linux Kernel Of Payments Infrastructures; Enterprise Payments Aggregator for immutable reliability and forensic auditability. Rooted in Linux principles Of Community. No vendor lock-in—governance, code, and ledger all verifiable. Implements: idempotency, distributed retries, circuit-breaker. Maintained by davidgracemann on GitHub, where it has earned 36 stars from the community.

It's actively developed around distributed-systems, microservices, payment-gateway-integration, and is a solid reference for anyone building with these tools.