💰 Billing & Payments knowledge for cloud platforms

Blnk is an open-source ledger & financial core for shipping fintech products fast.

Modern plain text accounting. Beancount compatible.

Double-entry bookkeeping library

Ledger implementation in golang

Double-Entry Bank Ledger in Go is a production-focused backend that demonstrates how to correctly handle money movements using strict double-entry accounting with PostgreSQL, Atomic transactions, concurrency-safe operations (serializable isolation + automatic retries), row-level locking, and full ledger reconciliation patterns used by fintech syste

Production-grade double-entry payment ledger in Go — Postgres, REST/gRPC, OpenTelemetry, CI/CD to VPS with GitHub Actions.

An Elixir double-entry library inspired by Ruby's DoubleEntry. Brought to you by CoinJar.

开源、本地优先的复式记账 · 开支/生意/投资多账本，财务总表一眼清 · Tauri + TypeScript

Open-source accounting software with double-entry bookkeeping, invoicing, and multi-tenant support

Idiomatic, ergonomic library of primitives for professional double-entry accounting in Rust

A wallet service built with go-kit

Event-sourced, double-entry ledger core in Go. Zero dependencies. Enforces balance, idempotency, deterministic replay, and currency isolation.

Open Source Double Entry Accounting + Crypto/Web3

A comprehensive, production-grade core banking system simulation built on the Jakarta EE 10 platform using EJB 4.0, Container-Managed Transactions (CMT), Hibernate JPA, Ehcache Second-Level Caching, Jakarta Security, and automated EJB Timer Services. Packaged as a multi-module Maven EAR application.

Double-entry accounting written in Elixir. Heavily inspired by ledger-cli

Rigorous double-entry ledger kernel for Python — no floats, idempotent posting, posting templates

Double-entry bookkeeping library for PHP

Self-hostable AI bookkeeper for freelancers and small teams

[Under Construction] MacOS Amatino client application