From WinTabber Software:
WinTabber can add tabs to many windows. A tabbed browser, tabbed putty, tabbed terminal or tabbed shell, tabbed anything. Multi tab your windows in seconds. A terminal or shell with tabs work faster and efficiently. Having multiple windows as tabs will give a better overview of your windows than before. Also having multiple ssh sessions by the click of a tab works faster and efficiently. Version 1.2.714 may include unspecified updates, enhancements, or bug fixes.