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




Trayconizer is described as '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' and is an app. There are more than 10 alternatives to Trayconizer for a variety of platforms, including Windows, Linux, PortableApps.com, Thunderbird and X11 apps. The best Trayconizer alternative is SmartSystemMenu, which is both free and Open Source. Other great apps like Trayconizer are RBTray, KDocker, RBTray Fork and 4t Tray Minimizer.
SmartSystemMenu extends system menu of all windows in the system. It appends next custom items to menu:




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

KDocker will help you dock any application into the system tray. This means you can dock Openoffice, xmms, Firefox, Thunderbird, anything!
Just point and click. Works for all NET WM compliant window managers - that includes KDE, GNOME, Xfce, Fluxbox and many more.



RBTray by Benbuck, fork of RBTray , is a small Windows program that runs in the background and allows almost any window to be minimized to the system tray by:



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:




FireTray is system tray extension for Linux and Windows that targets Mozilla Firefox, Thunderbird and SeaMonkey.



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!



Process Manager for Windows is a utility which allows you to to set process priority, minimize windows to the system tray, and more—all via taskbar window button right-click menus.



Minime is a tool that allows you to minimize applications to the system tray using a simple hotkey. What makes this tool somewhat unique is that it keeps your system tray clean by minimizing all applications into a single tray icon.

Clicky Gone allows you to hide your selected windows from view, this includes the taskbar button associated with the application. This utility particularly helps with protecting your privacy by hiding things like your browser with banking details up and someone walks in on you.



Min2Tray - a utility for MS WindowsTM NT and higher to minimize and hide a window to system tray area of taskbar as icon.