Crust CRM is described as '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' and is a CRM System in the Business & Commerce category. There are more than 50 alternatives to Crust CRM for a variety of platforms, including Online / Web-based, Windows, iPhone, SaaS and Android. The best alternative is ERPNext, which is both free and Open Source. Other great apps like Crust CRM are Odoo (Freemium, Open Source), Bitrix24 (Freemium), EspoCRM (Freemium, Open Source) and Corteza CRM (Free, Open Source).
ERPNext is a free and open-source integrated Enterprise Resource Planning (ERP) software developed by Frappé Technologies Pvt. Ltd. and is built on MariaDB database system using a Python based server-side framework.
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.
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.