"GGL resembles SuperKaramba, Screenlets, gDesklets, and KDE 4's
Plasma. All produce similar results and offer similar gadgets, and
the only reason to choose one over another is if it offers unique
gadgets you're particularly interested in. Some programs are
compatible with each other, allowing you to run gadgets from other
programs; there's even talk that Plasma will be able to run GGL
gadgets directly.
"GGL is licensed under the Apache License 2.0. It is currently
in version 0.10.0 and qualifies as "development" software, so
expect bugs. If you happen to find some quirky behavior or errors,
you can help by posting about your issues on the Google Groups user
forum. GGL developers visit this forum, so you should get an answer
and get the ball rolling to fix some of the remaining bugs."