1)   WinArranger Free 1.11
WinArranger helps you to use your workspace more effectively by arranging windows on your computer screen in the most optimal way. It can even hide borders and captions and system taskbar. Multi-monitor configurations are fully supported. Freeware.
arrange windows, tile windows, multi-monitor, screen organizer, window manager, desktop organizer,

 2)   TaskSwitchXP Pro 2.09
TaskSwitchXP is an advanced replacement for the standard Windows Alt-Tab dialog with previews and powerful task management capabilities.
TaskSwitch, TaskSwitcher, PowerToy, task, switch, switcher, window manager, shell, enhancement, Alt-Tab,

 3)   HeldUp 1.0
HeldUp keeps any application window in full view on the desktop. HeldUp is resource friendly because it's so small (70kb), and it's simple and easy to use. Just grab the icon from the system tray, drag and drop it on the window to hold up.
topmost, ontop, top, float, HWND_TOPMOST, utilities, window manager, system tray, window, systray,

 4)   AppAway 1.0
AppAway is the easiest way to hide any program. The program will not appear on the screen, in the taskbar or when you alt+tab. Just drag the AppAway icon from the system tray onto the software you want to hide. And AppAway is SMALL, it's only 72kb
hidden, privacy, private, utilities, window manager, system tray, window, systray,