Tray It! is a free software which allows you minimize any software’s window to the system tray area, it’s easy to use, very low resource usage, works with any app, portable and doesn’t need to be installed.
To temporarily minimize a window or dialog to the system tray, just holding down the ‘Shift’ button when minimizing it. To permanently keep it in the system tray, choose ‘Place in System Tray’ from the tray icon’s right button context menu.
Tray It! supports multilanguage: English, Bulgarian, Czech, Dutch, French, German, Hungarian, Russian, Spanish, Italian, Japanese, Portuguese and Turkish.
Tray It! supports Windows 7 / Windows XP / Windows 95/98/Me/NT/2000.
Download it from the developer’s website.
Alternatives to Tray It!
Minime is a similar software to Tray It!, it allows you minimize all applications to one single icon in the system tray using a simple hotkey, and it’s open source.
PowerMenu is a small freeware that gives you the power to set any window always on top or minimize it to tray.
RBTray is a small Windows program that runs in the background and allows almost any window to be minimized to the system tray by right clicking its minimize button. It is free, open source, and is distributed under the terms of the GNU General Public Licence.
Trayconizer allows you to minimize virtually any application to the system tray rather than having it take up valuable space in your taskbar.