WindowTabs

Meet WindowTabs: a lightweight, portable, and completely free open-source utility for Windows. It brings the convenience of browser tabs to your everyday programs—whether you’re working with documents in Office, browsing folders in File Explorer, viewing PDFs, or messaging on WeChat. Simply group windows into tabbed sets, merge them by dragging, and switch with a click. No installation needed—just run it and enjoy a cleaner taskbar and smoother multitasking.