Open Source ERP Software
An ERP is the system that everything else in a company eventually has to agree with - accounting, inventory, payroll, and sales all writing into one ledger of record - which is why migrating off one is so brutal and why the data model matters more than the feature list. The open source ERPs here put that schema and the business logic in front of you, so you can adapt workflows to how your company actually runs and keep the years of accumulated records in a database you control.
Odoo CRM
Open source CRM for managing prospects and customers inside Odoo's web based business apps
ERPNext
Open source ERP for accounting, inventory, orders, manufacturing, assets, projects, and daily operations
Aureus ERP
Laravel and Filament ERP for sales, accounting, inventory, HR, CRM, and projects
IDURAR
Self-hosted ERP and CRM for invoicing, quotes, accounting, inventory, and HR
Dolibarr
Web-based ERP and CRM for managing quotes, invoices, orders, stocks, accounting, and more
Ever Gauzy
Business management platform combining ERP, CRM, HRM, ATS, project work, and employee time tracking
metasfresh
Free and open source ERP for industry and trade, with sales orders, invoicing, and a REST API
Apache OFBiz
Java ERP system for automating enterprise processes, with apps for commerce, CRM, supply chain, and manufacturing
Axelor Open Suite
Full-web ERP suite with modular apps for CRM, finance, HR, projects, inventory, and production