Gadgets

A gadgets is a small technological object such as a device or an appliance that has a particular function, but is often thought of as a novelty. it is a small tool such as a machine that has a particular function, but is often thought of as a novelty.

Application Gadgets

In the software industry, "Gadget" refers to computer programs that provide services without needing an independent application to be launched for each one, but instead run in an environment that manages multiple gadget's. There are several implementations based on existing software development techniques, like JavaScript, form input, and various image formats.

Further information:

Google Desktop, Google Gadget, Microsoft Gadget.