Flatlogic provides low‑code scaffolding for web applications, but if you’re looking for fully‑featured, open‑source Customer Relationship Management (CRM) platforms you can host and customize yourself, the list below offers 20 robust alternatives.
Get targeted exposure with custom position pinning and highlighted placement.
A powerful fork of SugarCRM Community Edition, offering sales, marketing, and support modules with extensive customization.
Modular ERP with a full‑featured CRM, lead management, pipeline visualization, and integration with other business apps.
Lightweight, API‑first CRM that supports sales automation, dashboards, and custom entity creation.
Feature‑rich CRM/ERP suite with advanced workflow, reporting, and a modern UI built on Vtiger.
All‑in‑one ERP/CRM solution for small and medium businesses, offering contact management, sales pipelines, and invoicing.
Classic open‑source CRM with lead management, email integration, and a marketplace of extensions.
Non‑profit focused CRM for managing contacts, contributions, events, and email campaigns.
Open‑source ERP with a built‑in CRM for lead tracking, opportunity management, and customer portal.
Gamified CRM that adds points, badges, and leaderboards to sales activities, encouraging user adoption.
Enterprise‑grade, self‑hosted CRM built on the Crust platform, offering sales, marketing, and support modules.
Ruby on Rails based lightweight CRM focused on lead and contact management with a clean UI.
Java‑based CRM/ERP with a modular architecture, supporting multi‑currency, workflow, and extensive APIs.
Part of the Axelor ERP suite, offering a modern UI, workflow designer, and integration with accounting and project modules.
Groupware and CRM solution with contact, lead, and opportunity management, plus calendar and email integration.
Minimalist PHP CRM focused on quick lead capture, pipeline visualization, and email tracking.
Open‑source no‑code database where you can build a custom CRM using ready‑made tables and views.
Robust CRM with sales automation, marketing tools, and a flexible data model, built on Symfony.
Open‑source starter kit that provides a ready‑made CRM UI and API, ideal for developers who want a code‑first alternative to Flatlogic.
Open‑source marketing automation platform with contact management, lead scoring, and campaign tracking that can serve as a CRM.