iDempiere is an open‑source ERP/CRM/SCM suite. Below are 20 free (open‑source or freemium) accounting‑focused alternatives that can be used as standalone bookkeeping tools or as part of a lightweight ERP solution.
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Modular open‑source ERP with robust accounting, invoicing, and bank‑reconciliation features.
Full‑stack open‑source ERP with a powerful, user‑friendly accounting module, including multi‑currency and tax handling.
All‑in‑one open‑source suite; its accounting module supports invoices, payments, and simple reporting.
Lightweight web‑based accounting system for small businesses, covering GL, AR/AP, and inventory.
Open‑source accounting and ERP system derived from SQL-Ledger, offering GL, invoicing, and payroll.
Web‑based ERP with a strong accounting core, supporting multi‑company, multi‑currency, and extensive reporting.
Modular business platform with a mature accounting module, including analytic accounting and tax rules.
Enterprise automation framework offering accounting, invoicing, and financial reporting out‑of‑the‑box.
Open‑source ERP/CRM with a full‑featured accounting suite, suitable for SMBs.
Desktop personal and small‑business accounting software with double‑entry bookkeeping and reporting.
Free desktop accounting application (also offers a cloud version) with invoicing, payroll, and reporting.
Online free accounting software for freelancers and SMEs, featuring invoicing, expense tracking, and multi‑currency.
Freemium invoicing and billing platform with basic accounting, expense tracking, and client portal.
Free cloud‑based accounting suite for small businesses, covering invoicing, receipt scanning, and payroll (US/CA).
Free online accounting software with automated data entry, invoicing, and financial reporting.
Simple cloud accounting with invoicing, expense tracking, and basic reporting at no cost.
Free version of NolaPro ERP offering core accounting, invoicing, and inventory modules.
Open‑source retail‑focused ERP with a solid accounting core, suitable for small to mid‑size merchants.
Mature open‑source double‑entry accounting system, supporting multiple languages and currencies.
Free tier for businesses with ≤ $5,000 annual revenue; includes invoicing, expense tracking, and basic reports.