Strapi is the most popular open-source headless CMS with 65K+ stars, providing a content management backend that auto-generates APIs from content type definitions.
The admin panel includes a visual content type builder, media library, RBAC, i18n support, and draft/publish workflows. REST and GraphQL APIs are generated automatically with filtering, sorting, and pagination.
Built with Node.js, supporting PostgreSQL, MySQL, SQLite, and MariaDB. Plugin marketplace extends functionality with SEO, email, analytics, and custom integrations.
Self-hostable anywhere Docker or Node.js runs. Strapi Cloud provides managed hosting. Enterprise features include SSO, audit logs, and review workflows.