Twenty is a production-grade, open-source CRM delivered as a large Nx monorepo. The system is a full-stack TypeScript application: a NestJS backend (twenty-server) exposing GraphQL/REST APIs, a React frontend (twenty-front) with Jotai-based state management, a shared UI component library (twenty-ui), and shared TypeScript packages (twenty-shared). It provides multi-tenant workspaces, object-record CRUD with custom data models, role-based permissions, AI chat/agent capabilities (model tiers, tool calls, streaming), analytics via ClickHouse, and a CLI scaffolding tool (create-twenty-app) for bootstrapping custom apps. The architecture is modular with NestJS ConfigurableModuleBuilder patterns, event-driven design using Zod-validated schemas, and component-scoped state via atom families and component instance contexts.
Macro is a large open-source monorepo (AGPLv3) for an all-in-one collaborative productivity platform that unifies email, messaging, documents, tasks, CRM, AI agents, and more. The backend consists of 42+ Rust microservices following a consistent hexagonal architecture (domain/inbound/outbound), with PostgreSQL, OpenSearch, Redis, S3, Kafka/SQS/EventBridge for data storage and event-driven processing. The frontend is a SolidJS single-page application with a heavily customized Lexical editor, block-based content system, real-time collaboration via CRDT (Loro), and Tauri-based desktop/iOS apps. AI is a first-class feature with agent harnesses, MCP integration, and an AI editing worker. Infrastructure is managed via Pulumi and Docker Compose for local development. The codebase demonstrates high engineering craftsmanship with consistent patterns, extensive testing, and comprehensive observability, though the sheer scale and volume of generated code introduce some maintenance overhead.
IDURAR is a free, open-source ERP and CRM application built on the MERN stack (MongoDB, Express.js, React.js, Node.js) with Ant Design and Redux. It provides modules for invoice management, payment processing, quote generation, customer relationship management, inventory tracking, and financial reporting. The system features multi-language support (44 languages), PDF generation for business documents, role-based access control, and a responsive user interface. The architecture separates concerns with a RESTful API backend and a modular frontend utilizing React, Redux for state management, and Ant Design for UI components.