I am looking for a site that I can find applets for gnome-panel just like gnome-shell has this extension.gnome.org
Add new functionality to your Ubuntu panel. Whether you want to see the weather at a glance, disable your touchpad or manage your clipboard, indicator applets are what you’re looking for.
What are the best or favorite weather apps, applets, indicators available for Ubuntu 14.04? Preferably something with a small, unobtrusive icon that fits nicely in the gnome panel (flashback).
I had a nice indicator in 12.04 but I don't remember what it was called anymore and after upgrading to 14.04 it is gone.