I would like to know the name of this gadget:
Anybody got any idea what's it called?
I'm adding another answer because I think I've located it.
This is probably Multimeter, last version number 2.10, created by Johan Bourtembour, better known as SFkilla, and having had at its height a 100000 member community founded around it, and which was unfortunately closed down. This gadget was highly skinable, and had hundreds of skins available by the (now defunct) community.
I found a possible download from here, which was tested fine by Avast.
Below is one example skin published here, where is also explained how to use this gadget:
If the gadgets has an Options button, click it:
You'll then see the gadget's name: