Flamelink.io - Flamelink.io is a headless CMS for Firebase.
DocGen - Static website generator
Contentful - You don't need another CMS. You need a better way to manage content — unified, structured, and ready to deploy to any digital channel.
openSourceCM - Web-based legal document processing and contract management
Strapi - Strapi is the most advanced Node.
OnBase - OnBase is an enterprise content management and process management software suite.