GhostTile!

Allows almost any program to be minimized to the system tray by right clicking its minimize button.

4t Tray Minimizer is a lightweight but powerful window manager, which helps you to free up space on the desktop and the taskbar via the following actions:

SmartSystemMenu extends system menu of all windows in the system. It appends next custom items to menu:

The Wonderful Icon is a small Windows utility that resides in your PC's taskbar tray. With it, you can:

PowerMenu is a small application that some extra menu items to the windows control menu in addition to the standard "Close", "Maximize", etc options. The extra menus are: Priority, Always On Top, Transparency and Minimize To Tray.

TopMenu is a functionality clone of PowerMenu, but designed to be compatible with Windows 7 and 64-bit systems.

TrayIt! - minimize to the system icon tray any program (Outlook Express, Notepad, Word, Internet Explorer, Sunbird, Thunderbird, Opera, OpenOffice etc.) and get more room in the Taskbar!

AllTray is a program you can use on Unix-like systems such as GNU/Linux or FreeBSD running the X Window System to dock any application which doesn’t have a native tray icon into the system tray/notification area. AllTray works with many desktop environments and window managers, including Metacity on GNOME and KWin on KDE. The current release of AllTray is 0.7.2dev, and can be downloaded from Launchpad; the most recent stable release is 0.70 and is also available at that location

HideWin sits in the system tray and enables you to hide any top-level window with its popup tray menu or an ALT+letter hotkey that it assigns automatically. It appears to be abandonware, but it is only 13KB and still works.

KDocker will help you dock any application into the system tray. This means you can dock Openoffice, xmms, Firefox, Thunderbird, anything!

Trayconizer allows you to minimize virtually any application to the system tray rather than having it take up valuable space in your taskbar. The screen shot to the left shows Trayconizer minimizing Notepad to the system tray.Using Trayconizer is simple. To start Trayconizer on Notepad, you would execute: C:\Path\To\Trayconizer.exe C:\Windows\Notepad.exe.