Hi,

As part of their IEG [1], Eran and Ravid have mapped the gadget use in all wm projects
https://meta.wikimedia.org/wiki/Gadgets

It gives a good overview of gadget popularity and may help to discover hidden gems.

Cheers,
Micru


[1] http://blog.wikimedia.org/2014/04/22/visualeditor-gadgets/