WindowTabs

Free, open-source, and portable, WindowTabs transforms how you handle multiple windows on Windows. It adds a familiar tab bar to most desktop apps—like Office, File Explorer, PDF tools, WeChat, and editors—so you can cluster windows into groups, drag to combine them, and jump between tabs in a snap. By reducing taskbar overload and simplifying window navigation, this lightweight tool helps you focus and work more efficiently without any installation hassle.