Open Source Vtiger CRM Alternatives

Odoo (formerly OpenERP) is a suite of open-source business apps written in Python and distributed under the AGPL license, under the Open Core software business model. It is used by 2 million users worldwide to manage companies of all size.

EspoCRM is an Open Source CRM (Customer Relationship Management) software that allows you to see, enter and evaluate all your company relationships regardless of the type. People, companies, projects or opportunities. Written in PHP and JavaScript.

Crust CRM is a 100% free and open-source CRM. It's fully featured and includes rich dashboards, automation rules (workflows), collaborative team messaging and much more. You can customise your CRM with the included low-code development platform.

Mautic is marketing automation software (email, social, & more). Install on your own website or create a free hosted account.

Corteza CRM is an advanced Free and Open Source Customer Relationship Management platform. Feature rich, a cloud scalable architecture and entirely modular, Corteza CRM allows any organisation to create the CRM environment tailored to their context.

SuiteCRM provides an enterprise-grade Customer Relationship Management (CRM) application to a global community of users and software developers. It is a robust and credible alternative to Salesforce, Microsoft and the major CRM vendors.

ICTCRM is the modern Customer Relationship Management (CRM) software system for running any type of Business. It bundles Unified Communications. It features complete business process automation and integration of communication technologies.

JoForce CRM, an Open Source CRM for your business. No matter what type of business you run, JoForce suits businesses of all sizes. You can efficiently manage all your business data and customer communication in one place without much effort.

Fat Free CRM lets small businesses organize and maintain information on all of their customer relations. It provides management of corporate information such as customer contacts, customer accounts, sales leads, and sales opportunities.

Tine 2.0 is an open source project, which combines groupware, CRM and ERP into one system and is therefore useful for the the whole company.