Open-source Cloze alternatives

Twenty is an open-source CRM presented as an open alternative to Salesforce and designed for AI. It supplies technical teams with the components to assemble a custom CRM that adapts as the business changes, and the idea is that you build, ship and version it like the rest of your software stack.

The core building blocks are objects, views, workflows and agents, and all of them can be extended as code. A Twenty CLI scaffolds new apps, where you define objects, fields and views as code and then publish them to your workspace, with a guide covering views, agents and logic functions. For people using coding agents, the project provides official skills that work with Claude Code, Codex, Cursor and other harnesses. The stack is TypeScript with NestJS, React, GraphQL and PostgreSQL.

You can sign up at twenty.com for the managed cloud, which needs no infrastructure, or self-host with Docker Compose. The repository's license is listed as 'Other', so review it before commercial redistribution. Twenty suits teams that want a CRM they can shape in code instead of being limited by a fixed SaaS data model.

Relaticle is an open-source customer relationship manager that you host yourself. It handles the usual CRM records, including contacts, companies, opportunities, tasks and notes, and is built with Laravel, Filament and Livewire. Its distinguishing angle is that it is designed to work with AI agents as well as people.

The project ships an MCP server that exposes dozens of CRM tools to agents such as Claude or GPT-based assistants, plus a REST API with full create, read, update and delete access, schema information, activity history and pipeline analysis. The data model is customizable, with many custom field types, relationships between entities and per-field encryption, and each workspace is isolated from the others.

Relaticle is licensed under AGPL-3.0, so your data stays on your own server. It requires PHP, PostgreSQL, Composer and Node.js, with Redis optional for queues, and a self-hosting guide covers Docker and manual setups. The project tags itself as an alternative to Attio, and it targets developer-led teams, startups and small businesses wanting AI integration without vendor lock-in.