Odoo packages a whole business in one place - CRM, accounting, inventory, ecommerce, manufacturing, and HR as integrated apps that share a single database, with a genuinely capable open source Community edition you can run yourself. The catch is the open-core model: the most useful pieces, from full accounting and advanced inventory to studio customization and many app refinements, are reserved for the paid Enterprise edition, and Community is deliberately kept a step behind. As your team grows, that gap quietly pushes you toward per-user Enterprise licensing and Odoo-hosted plans. The fully-open options below give you complete apps without a gated upper tier - the features ship in the version you can install, self-host, and modify, with your data and custom modules staying entirely under your control.
Odoo CRM is the web-based, open source CRM app within Odoo's suite of business applications. It tracks prospects and customers through the sales pipeline and can run on its own or alongside the rest of the suite.
ERPNext is a 100% open source ERP system for running business operations in one place. It covers invoices, stock tracking, personnel management, accounting, order management, manufacturing, asset management, and projects, reducing the need to buy separate software for each task.
Aureus ERP is an open source enterprise resource planning platform for small and medium businesses as well as larger organizations. Built on Laravel 13 and FilamentPHP 5, it brings accounting, inventory, HR, CRM, and project management into one system with role-based access control via Filament Shield.
IDURAR is an open source ERP and CRM for invoicing, quotes, accounting, inventory, and HR. It is aimed at teams that want to run business operations from software they host themselves, with invoice, payment, quote, and customer management as the core modules.
Dolibarr is an ERP and CRM suite for companies, foundations, and freelancers. It manages day-to-day business activity such as contacts, quotes, invoices, orders, stocks, agenda, accounting, and human resources from one web application.
InvenTree is an open source inventory management system that provides low-level stock control and part tracking. It is aimed at teams that need to manage parts, stock locations, and supplier information in detail rather than as a simple item list.
SuiteCRM is an open source customer relationship management application for SMEs and enterprises. It gives organizations full control of their customer data and the freedom to own and customize their business system instead of relying on a proprietary CRM.
Ever Gauzy is an open source business management platform that brings ERP, CRM, HRM, applicant tracking, and project management into one system. It tracks clients, employees, finances, and projects, with modules for sales, accounting, invoicing, billing, expenses, and inventory.
metasfresh is a free and open source ERP system for companies in industry and trade. It targets businesses that need scalable, flexible software with a web-based interface for sales orders, shipments, invoicing, and related day-to-day operations.
Corteza is a low-code platform for building CRM, business process, and other structured data apps. It ships with a CRM application out of the box and lets teams iterate on the data model and screens without writing a full application from scratch.
Part-DB is an open source inventory management system for electronic components. It runs on a web server and is used from any browser without extra software, giving hobbyists, maker spaces, small companies, and universities one place to track parts, locations, prices, and datasheets.
Horilla is a free and open source HRMS that brings core HR workflows into one system. It covers recruitment, onboarding, employee management, attendance, leave, payroll, performance, offboarding, asset management, and a helpdesk module.
Apache OFBiz is an open source enterprise resource planning system written in Java. It bundles libraries, entities, services, and business applications to automate enterprise processes across ERP, CRM, e-commerce, supply chain management, and manufacturing resource planning.
Axelor Open Suite is an open source full-web ERP suite that bundles business apps for managing day-to-day operations. Its modules can be activated individually, so a deployment can start with a few features and add more as needs grow.
ADempiere is a business suite that combines ERP, CRM, manufacturing, supply chain, and point of sale in one system. It targets organizations that want a single application for finance, operations, and sales rather than separate tools stitched together.
iDempiere is an open source ERP, CRM, and supply chain management suite for running core business operations. Developed by a worldwide community of small businesses, implementors, and end users, it descends from ADempiere and Compiere and carries business logic refined over years of real-world use.
OpenConstructionERP is an open-source construction ERP that combines estimates, schedules, tenders, contracts, site tasks, and reports in one platform. It brings bill of quantities (BOQ) work, 4D scheduling, and 5D cost control together for construction project management.
Tryton is open source business software for companies of any size, built as a modular ERP and business management platform. It aims to cover a wide range of business needs from a common base rather than locking you into a single fixed application.
OCA Field Service is a collection of Odoo add-ons for field service management. The core fieldservice module manages service locations, workers, and orders, and the surrounding modules extend it into a full FSM workflow inside an Odoo deployment.
NotrinosERP is an open-source, web-based ERP system written in PHP and MySQL. It brings accounting, CRM, sales, purchasing, warehousing, manufacturing, payroll, and human resource functions into one self-hosted application for small and medium businesses.
OCA Payroll is a set of Odoo addons that add payroll to an Odoo deployment. It targets organizations that already run Odoo and want to handle payroll inside it rather than bolting on a separate payroll system.
Kriol Open Source Point of Sales (kriolosPOS) is a desktop point of sale application for retail checkout and store operations. It is a fork of uniCenta oPOS 4.5, which itself descends from OpenbravoPOS and the earlier Librepos (Tina POS), continuing a long lineage of open source Java POS software.
Beveren FSM is a field service management app for ERPNext, built for service businesses that handle requests, technician schedules, on-site work, spare parts, and billing. It aims to replace manual or fragmented ERPNext workflows with one integrated service module.
Start by deciding whether you are replacing Odoo as a whole ERP or only the parts that caused friction. Odoo's value is the shared data model between sales, inventory, accounting, manufacturing, projects, and website flows. That is also what makes replacement hard: a quote may become a delivery order, invoice, stock move, and accounting entry with little visible boundary. A good open source replacement plan maps those cross-module handoffs first, then decides whether one integrated suite or several specialized systems can own them without duplicate data entry.
Be realistic about the gaps. Moving off Odoo often means giving up a single UI for every department, the Odoo app ecosystem, and Enterprise features that may have filled important holes. Watch for areas where details matter: accounting localizations, payroll rules, point-of-sale hardware, barcode flows, manufacturing routings, email templates, and permission rules. Many open source ERP projects are strong in core records but weaker in polished mobile screens, report designers, or low-code customization. Decide which gaps are acceptable process changes and which require implementation budget.
Migration works best as a controlled rebuild, not a blind database move. Export master data first: companies, contacts, products, units of measure, price lists, taxes, chart of accounts, warehouses, and users. Then migrate open transactions such as sales orders, purchase orders, invoices, stock quantities, and work orders. Odoo can export many records through the UI, and larger moves may use the external API or database access when you control the instance. Attachments, custom fields, internal IDs, message history, and computed fields need special handling. Keep a read-only Odoo archive for closed history.
Partly. Odoo has a Community edition under an open source license, while Odoo Enterprise and some hosted capabilities are proprietary. If you use only Community, the question is whether a different open source ERP fits your workflows better. If you use Enterprise, identify each Enterprise-only feature before assuming another system can replace it without new code or process changes.
Start with the operational chain that creates money or inventory movement, not with the easiest module. In many Odoo installations that means sales order to delivery to invoice, or purchase order to receipt to vendor bill. Once that chain is stable, migrate secondary functions such as CRM, projects, website forms, or internal approvals around it.
It depends on whether you need full historical ledgers or only opening balances and open documents. Full accounting migration requires chart of accounts mapping, taxes, journals, currencies, analytic accounts, reconciliations, and audit references. Many teams close a fiscal period in Odoo, import opening balances into the new system, and keep Odoo read-only for historical drill-down.
For standard records, Odoo's list views can export CSV or spreadsheet files when the user has export rights. Larger migrations usually use the external API or direct database access if you control the deployment. Attachments and uploaded documents need separate handling because they may live outside normal table exports. Test exports on restored copies before touching production.
Not directly. Custom Odoo modules are written around Odoo's model layer, views, security rules, and workflow conventions. The useful assets are the business rules, field definitions, reports, and test cases. Treat the old code as documentation and rebuild the behavior in the target system's extension model instead of trying to port files one for one.
Maybe, but do not assume the same breadth or the same handoffs. Odoo's appeal is that many modules share records and UI patterns. Another open source stack may handle core ERP well but need separate tools for ecommerce, help desk, payroll, marketing automation, or document signing. Decide where integration is acceptable and where a single transaction model is mandatory.
Check the license for the core system, then check the license for required extensions, connectors, themes, and mobile clients. Open source does not remove hosting, support, implementation, testing, or compliance costs. Also verify whether any replacement uses a dual-license model or proprietary add-ons for features you consider baseline, such as advanced accounting or barcode operations.
Inventory every integration that reads from or writes to Odoo: ecommerce, payment, shipping, tax, reporting, warehouse devices, email, and identity. During cutover, choose one system of record for each object and freeze conflicting write paths. Recreate API credentials, scheduled jobs, and webhooks in the new system, then reconcile record counts and recent transactions before reopening normal operations.
Keep it available as a read-only archive until legal, tax, and operational retention needs are met. Preserve the database, filestore, configuration, custom modules, and the exact access method needed to view old records. Remove public write access, disable outgoing emails and scheduled jobs, and document how backups are restored so historical invoices or audit trails remain usable.
