Odoo
Modular open-source ERP — CRM, accounting, inventory, eCommerce, and 30+ business apps.
LGPL-3.0 alternative to SAP and NetSuite. Self-host the Community Edition or use Odoo Cloud — integrated apps for sales, operations, finance, and HR.
Twenty
AI-native open-source CRM — customize objects, workflows, and apps like code.
AGPL-3.0 alternative to Salesforce. GraphQL/REST API, custom objects, MCP server, and Docker self-hosting — from $9/user cloud or free self-hosted.
Krayin
Self-hosted Laravel CRM for leads, pipelines, and customer lifecycle management.
MIT-licensed alternative to Salesforce. Kanban leads, quotes, email sync, and modular extensions — built on Laravel and Vue.js for SMEs and enterprises.
Erxes
Experience Operating System — marketing, sales, ops, and support unified.
AGPL-3.0 XOS platform replacing HubSpot, Zendesk, and more. Plugin-based TypeScript monorepo with Docker self-hosting — free core, enterprise modules available.
EspoCRM
Simple, customizable open-source CRM — self-hosted since 2014.
AGPL-3.0 alternative to Salesforce. Leads, pipeline Kanban, email marketing, customer portal, and Entity Manager customization — Docker or manual install.
Open Mercato
AI-engineering framework for CRM/ERP — start at 80% done.
MIT modular monolith with pre-built CRM, sales, and ERP modules. Architecture-aware AI harness, multi-tenant RBAC, and spec-first development for Cursor/Claude Code.
Atomic CRM
Full-featured CRM in React + Supabase — fork and deploy in minutes.
MIT CRM by Marmelab (React Admin). Contacts, deals Kanban, tasks, email capture — ~15k LOC with shadcn/ui, deploy to Supabase + GitHub Pages.