Lucid
Lucid will add automatic transparency effects to any window. Adding a window is as simple as dragging an icon over it. Once a window is added to Lucid's list it will automatically switch between the user defined minimum and maxium transparency. Lucid uses the window's class name for... Lucid can be enabled and disabled quickly using its system tray interface.
http://www.xenossoftware.com/lucid/download.php - 340Kb - Download - Screenshot

CowSpy
CowSpy idea: Many programmers have been in a situation where they see another program window and they think how is that GUI build up. Or perhaps th programmer is trying to write a program that interfaces with a specific program. For instance but an extra button in another program. ... * Enable and disable buttons or even whole windows or other components (including but not limited by textboxes, modal windows, scrollbars, listboxes, comboboxes, etc.. ... * See the handle of all these windows. ... * See the Parent child structure between windows their childwindows and components like buttons...
http://www.nakencow.tk/cowspydownload.php - 79Kb - Download - Screenshot

12Ghosts Robo
At certain events (appearing of a Window, for example), let this helper respond on your behalf. No longer bother about regular questions, for example if you want to create a new firewall rule now ('No'), hang up your Internet connection ('No! '), or if you want to accept the other cookie ('Argh! ... 12-Robo positions new windows for you. ... Automate repeated tasks in Windows. ... This Windows extension also starts programs, for example 12-WinControl to position a window. ... - Never again look at a window that you don't want to see.
http://12Ghosts.com/download/12robo.exe - 2Mb - Download - Screenshot

XNeat
Taskbar, Titlebar AND System Tray Utility that Extends Windows' features. XNeat adds more functionality to windows by adding extra buttons beside the default Windows Titlebar buttons (Min, Max, Close) 1) TaskBar Utility ( Manager - Sorter - Arranger ) : allows you to order ( sort ) taskbar's... 5) Roll Up / Down: feature lets you increase your desktop area by shrinking windows so that ONLY windows titlebars appear. ... 4) Transparency: feature lets you control how glassy your windows are. ... When any window is selected to be Transparent it will show the windows behind it ..
http://www.xneat.com/download/XNSetup.exe - 245Kb - Download - Screenshot

Auto Window Manager
Auto Window Manager automatically manages any window you specify. For instance, some web browsers open up in a non-maximized window. Using Auto Window Manager,you can set those windows to automatically maximize (minimize, normal, minimize to tray,stay on top) every time they're opened. ... Auto Window Manager adds several menu items to standard window menu accessible via application icon in the title bar. ... The commands are:Minimize to system tray, always keep window on top, Set window transparency, align window, resize window.
http://www.eusing.com/Download/AWMSetup.exe - 650Kb - Download - Screenshot

Hide Window Hotkey
Hide Window Hotkey is a utility which allows you to hide the windows, and programs which are running on your screen. It will instantly hide or close all (or some) programs on your screen through Mouse Hotkey or Keyboard Hotkey in order to prevent uninvited persons from seeing them. ... It also can set application windows transparency. ... Using Hide Window Key,you can set those windows to automatically maximize (minimize, normal, minimize to tray,stay on top) every time they're opened. ... It can also protect the hidden windows with a password.
http://www.elongsoft.com/download/HWHSetup.exe - 883Kb - Download - Screenshot

WinTopMost
WinTopMost can put topmost automatically any window and/or disable its X close button (window's top right corner). Main features : - Runs on Windows 95/98/NT 4. 0/Windows 2000. - Put allways on top any window or comme back to a "normal" (non topmost) window - Disable or enable X close button of... WinTopMost intercepts windows captions when programs are running (can intercept many strings and set topmost many windows). ... WinTopMost intercepts windows captions when programs are running (can intercept many strings and disable X close buttons of many windows).
http://peccatte.karefil.com/software/WinTopMost/WinTopMost.zip - 2Mb - Download - Screenshot

WinTopMost Disable Close
WinTopMost can put topmost automatically any window and/or disable its X close button (window's top right corner). Main features : - Runs on Windows 95/98/NT 4. 0/Windows 2000/XP. - Put allways on top any window or comme back to a "normal" (non topmost) window - Disable or enable X close button... WinTopMost intercepts windows captions when programs are running (can intercept many strings and set topmost many windows). ... WinTopMost intercepts windows captions when programs are running (can intercept many strings and disable X close buttons of many windows).
http://peccatte.karefil.com/software/WinTopMost/WinTopMost.zip - 2Mb - Download - Screenshot

Subclassing ActiveX
The control element accomplishes a subclassing for a window stated by its handle. The window function is the function of a window, which completely determines the behavior of the window (and thus the reaction of the window to user inputs). This window function is replaced by another function by... This function then can be freely defined in the Message event of the Subclassing control element (MS Windows API programming). ... It is possible to either replace (StopMessage = True) or only to supplement the original window function (StopMessage = False).
http://www.sensalgo.com/downloads/saoeasax.zip - 2Mb - Download - Screenshot

Ultradesk
Ultradesk the next generation virtual desktop. With Ultradesk you can: Switch from one desktop to another quickly by using mouse or hotkeys. User-definable hotkey to move a specific window from one desktop to another. Each desktop can have it's own screen saver, wallpaper and icons layout. ... Supports Windows 95/98, Windows 2000, Windows Me and Windows XP. ... User-definable auto starting when windows is starting. ... Sticky window and sticky program. ... One click to move a specific window from one desktop to another.
http://www.kaolay.com/download/ultradesk-1.1beta2build0126.zip - 160Kb - Download - Screenshot