Tumbleweed (Axway Secure Transport) is a managed file transfer system that uses a dynamic SFTP server to transfer files. It allows users to register and schedule file movements and program executions based on time or file conditions. Tumbleweed uses Tomcat as a front-end Java server, MySQL for database storage, and Cygwin to run external commands from a Unix-like environment on Windows. It provides encryption, active directory integration, and reporting on file transfers.