I'm trying to show the excerpt+thumbnail of all subpages in a specific parent; I tried a bunch of plugin but no one actually works as I need; andy advice?
I recently wrote code that I just put into a new page template that does exactly this. The all you do is assign the parent pages that specific template (or any page you wish to have this functionality on) and then it'll list it's child pages with their featured images as thumbs.
Getting a plugin for this would probably be kind-of complex since it all depends on the layout and styling you want as well... so just writing the code into a template like I did, is probably easiest. That way you control the look and feel too...
If you're interested in the code, let me know.