Fat Free CRM is a lightweight, PHP‑based open‑source customer relationship management system. Below is a curated list of 20 other open‑source CRM platforms that you can self‑host, customize, and extend to fit your sales, marketing, and support workflows.
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A fully‑featured fork of SugarCRM Community Edition offering sales automation, marketing campaigns, customer support, and extensive reporting.
A modern, entity‑centric CRM built with PHP and Vue.js, supporting sales pipelines, activity streams, and customizable dashboards.
A powerful CRM/ERP suite derived from Vtiger, featuring advanced workflow automation, AI‑driven insights, and a modular architecture.
An integrated CRM and help‑desk solution with sales, marketing, inventory, and project management modules.
A nonprofit‑focused CRM that manages contacts, contributions, events, and mass mailings, fully integrable with Drupal, Joomla, and WordPress.
A combined ERP and CRM suite offering contact management, sales pipelines, invoicing, and project tracking in a modular package.
Gamified open‑source CRM built on Yii PHP framework, emphasizing user engagement, sales automation, and customizability.
A flexible CRM and marketing automation platform with drag‑and‑drop workflow designer, lead scoring, and analytics.
A low‑code, API‑first CRM that provides contact management, pipeline tracking, and seamless integration with other Crust services.
An open‑source ERP system whose CRM module includes lead management, pipeline visualization, and email integration.
A Java‑based CRM with a rich data model, customizable UI, and support for B2B/B2C processes.
A modular open‑source suite where the CRM app offers lead capture, pipeline management, and activity scheduling.
Part of the Axelor ERP platform, this CRM provides lead tracking, opportunity management, and a visual Kanban board.
A lightweight Node.js/React starter kit for building custom CRM solutions, featuring authentication, contact CRUD, and activity logs.
An integrated groupware and CRM system offering contact management, sales pipelines, and calendar synchronization.
A PHP‑based CRM focused on e‑commerce and B2B, providing customer segmentation, marketing automation, and analytics.
A community‑driven CRM that combines email marketing, contact management, and simple sales pipeline features.
While primarily a marketing automation platform, Mautic includes contact management, lead scoring, and campaign tracking that can serve as a lightweight CRM.
The classic open‑source version of Vtiger CRM, still maintained by the community for basic sales and support needs.
A stripped‑down CRM‑only distribution of Dolibarr, focusing on contacts, opportunities, and activity tracking.