Window
This is a robust DHTML Window widget that replicates the look and functionality of a traditional pop-up window, minus the intrusiveness.
More Info 
Developer: Dynamic Drive
License: Freeware
Operating System: All
This auto centering window Javascript will open a window (DHTML) and keep that pop up window centered on the visitors page.
Developer: TPCS
License: Freeware
Operating System: Linux, Unix, Windows
Popup window replacement (a box will be shown on the page when visitor clicks a hyperlink).
Developer: JTricks.com
License: Freeware
Operating System: Not Available
This javascript DHTML fly-in popup window is like those you're seeing all over the web these days.
Developer: www.bmgadg.com
License: Freeware
Operating System: Linux, Unix, Windows
Pop-under window w/ random URLs is multi-platform compatible.
Developer: http://www.javascriptkit...
License: Freeware
Operating System: All
Open links in new window is a Unix compatible script that allows you to add the option of allowing links on your page to be opened in a new window with this powerful script.
Developer: Dynamic Drive
License: Freeware
Operating System: Unix
1st Window Maximizer is a multi-platform compatible script that automatically maximizes any window where the code is placed.
Developer: CgiScript
License: Freeware
Operating System: Unix/Linux/Windows
Pop-up Window Generator is a multi-platform compatible free online script generator to create a custom Pop-Up Window for your site.
Developer: SpriteWorks
License: Freeware
Operating System: Unix/Linux/Windows
* Flying Popup Window * is a multi-platform compatible script that creates a popup window that flies around the screen.
Developer: CGIscript.net
License: Freeware
Operating System: Unix/Linux/Windows
Modeless Window Script is multi-platform compatible.
Developer: http://www.dynamicdrive....
License: Freeware
Operating System: All
Auto-sizing Image Popup Window Script is a multiplatform compatible script that will launch a popup window that automatically loads an image and resizes itself to fit neatly around that image.
Developer: CodeLifter
License: Freeware
Operating System: Unix/Linux/Windows
Popup Window Maker is multi-platform compatible.
Developer: http://javascript.about....
License: Freeware
Operating System: All
Window Switcher is a multi-platform compatible script that will present to the Visitor the link "Comments" that opens a Pop Up.
Developer: ics3w.com
License: Freeware
Operating System: Unix/Linux/Windows
Scriptomizers - Popup Window Creator multi-platform compatible.
Developer: http://www.scriptomizers...
License: Freeware
Operating System: All
Auto-centering Popup Window is multi-platform compatible.
Developer: http://dynamicdrive.com/...
License: Freeware
Operating System: All
Pop-under window is multi-platform compatible.
Developer: http://www.javascriptkit...
License: Freeware
Operating System: All
Ace Window Move-to is a multi-platform compatible script that automatically moves a window to a specified X,Y coordinate.
Developer: CgiScript
License: Freeware
Operating System: Unix/Linux/Windows
Print Out Current Window Script is a multi-platform compatible cut-and-paste script opens the Print Dialogue, and lets your visitor print out the current page.
Developer: CodeLifter
License: Freeware
Operating System: Unix/Linux/Windows
Ace Window Close Timer is a multi-platform compatible script that gets a popup window to close after a pre-determined amount of time.
Developer: CgiScript
License: Freeware
Operating System: Unix/Linux/Windows
Flying Focused Ad Window is a multi-platform compatible script that creates a popup window when the launch page loads.
Developer: codebelly.com
License: Freeware
Operating System: Unix/Linux/Windows