Visual Tooltip is described as 'Makes it possible to show a thumbnail of a window by putting the mouse cursor over a button of the taskbar' and is an app in the os & utilities category. There are 2 alternatives to Visual Tooltip for Windows and Linux. The best Visual Tooltip alternative is DockbarX, which is both free and Open Source.
DockBarX is a lightweight taskbar / panel replacement for Linux which works as a stand-alone dock (called DockX), as an an Avant Window Navigator applet, as a Xfce4 panel applet1, as a matepanel applet2 or as a legacy gnome2 panel applet.
Visual Task Tips is a lightweight shell enhancement utility. It provides thumbnail preview image for each task in the Windows Taskbar, as seen in the Microsoft Windows Vista.
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