Maybe best out there

Really best accordion plugin i tested.

I like idea it is only accordion. Most of the other i used and tested are to much. You can expect custom gallery shortcode together with accordion/tabs shortcodes.
Less is more should be principle. And here is a proof. I achieved more functionallity and better design with this simple plugin, then with many other heavy plugins.

Small tip for others. Play with Font Awesome inside accordion header. Before, after. All classes needed are already there. You can achieve very elegant results. Just play with SVG icons, colors and open/close classes.