Free volume calculation software for windows

I had a need to show some Widgets which look like "Drive Space Monitor" from Keith DeBickes. One of those was to show the sounds volume. So I modified VolumeBar from Jordan Mandel to fill my needs...
Volume Tiny allows you to modify all the volumes, and not only the master one. So when you double-click on the Widget it will show the systems Volume Control window.

This Widget allows you to control your volume simply.
It works great in Heads Up Display.
Volume Controler widget is a quick way to modify your system volume without opening a lot of windows.

Vortex ATT can lower and raise the volume with one click. Once loaded, an icon will appear next to the clock in the system tray. A single-click will lower the Windows master volume a given percentage, and a second click will restore the volume. ATT is fully customizable - adjust the time it takes to fade down and up separately and specify whether to load at boot time. ATT also accepts command line parameters to better control fading (for hotkey fans.)

I couldnt resist the impulse to make some graphic changes to the volume controller Widget by Jordan Mandel!
volume bar is a free widget that lets you to adjust the sound volume.

Radioactive Decay Calculation Applet 1.0 is a rather praiseworthy program that reads information (element, nuclide number, half life) from a database. Then the following calculations can be performed: activity at a certain date (whether in the future or in the past); date at which a certain activity will be (or was) reached. Dates can be entered either manually or by using the calendar buttons."