1)   XNeat 2.0.0.3
Titlebar, Taskbar AND System Tray Icon Utility in the must have list. XNeat gives you full control over your Windows by extending it's features: 1) Stay On Top 2) Send To Tray 3) Taskbar Manager 3) & More Once you try it, you will love it .. !
taskbar manager, arranger, sorter, taskbar utility, minimize to tray, tray icon, always on top, stay on top, taskbar, transparent,

 2)   JumpKeys 1.21
Hot keys for selecting (switching) windows, minimizing/maximizing, making windows Always On Top. Tag 9 windows, on full/partial title, selected using the numbers on the main keyboard, either alone or with the Alt key (Alt+1, Alt+2...), Ctrl key, etc.
select windows, desktop utility, window managers, capture title, system-wide, instant control, stay on top, hot keys, hotkeys tool, active,

 3)   Auto Window Manager 1.2
Auto Window Manager resize your programs automatically every time they start,such as maximize,minimize,normal,minimize to tray.It also set application windows transparency,minimize them to tray,stay on top,align and resize from window system menu.
custom window, customize, manage window, max window, window maximizer, transparency window, minimize to tray, stay on top, always on top,

 4)   Active Captions 1.51
Active Captions is a handy utility that extends window's caption buttons with additional features. Right mouse button click on minimize button minimizes the window into the system tray.
system tray, minimize to tray, rollup window, stay on top, winshade, hotkey. shell, enhancement, extension,