What is Azure DevOps Server? Collaborative software development tools for the entire teamPreviously known as Team Foundation Server (TFS), Azure DevOps Server is a set of collaborative software development tools, hosted on-premises. Azure DevOps Server integrates with your existing IDE or editor, enabling your cross-functional team to work effectively on projects of all sizes. Integration Open and extensibleIntegrate your custom tool or third-party service with Azure DevOps Server using open standards like REST APIs and OAuth 2.0. Integrate your favorite tools and services from our marketplace of extensions.Azure DevOps Server ExpressFree version for individuals and small teamsUse Azure DevOps Server Express as individual developers or teams of five or fewer, at no cost. Easily install on your personal desktop or laptop without needing a dedicated server. Upgrade to Azure DevOps Server when your team has grown beyond five team members and take your full history with you.