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Odoo CRM — open source alternative

Open source CRM as part of a full ERP suite — free Community edition available.

Strengths

  • CRM integrates natively with invoicing, inventory, email marketing, and 30+ other modules.
  • Community edition is genuinely free and self-hostable.
  • Huge ecosystem of community modules and certified partners.

Weaknesses

  • Community edition lacks some features (e.g., email marketing, studio customizer) — Enterprise starts at $20/user/month.
  • Upgrade path between major versions can be painful.
  • The line between open source Community and proprietary Enterprise is intentionally blurry.
License: LGPL-3.0 Self-host difficulty: 3/5 Hosted cloud optionMobile: iOS, Android

Official site · Source on GitHub

More open source in this category

Discover other projects tagged CRM & Sales on the category page.

Other open source projects in CRM & Sales

SuiteCRM

Open source enterprise CRM — SugarCRM fork.

License: AGPL-3.0

EspoCRM

Fast, lightweight open source CRM.

License: AGPL-3.0

Twenty

Open source CRM positioned as a Salesforce alternative.

License: AGPL-3.0

Recommended reading

Escaping Salesforce: an honest guide to open source CRMs in 2026

Salesforce costs a fortune, requires consultants to configure, and locks your data in. Here's what actually works as a replacement — from battle-tested SuiteCRM to the new wave of Twenty and EspoCRM.

When self-hosting goes wrong: seven failure modes and how to avoid them

An honest retrospective on the ways self-hosted setups break — not in theory, but in practice — and the small habits that prevent most of them.

Will the open source project you depend on still exist in three years?

Bus factor, maintainer burnout, funding models, and the signals that separate OSS projects that survive from those that quietly decay.