accordeon-menu-ck

Allows a huge number of settings, yet the frontend code is minimalistic. Uses the jQuery of WP for transitions / easing, so own JS is very small. The only problem is that it includes CSS styling directly in the head of each page, but you can first style the menu using the plugins great facilities, then copy the CSS to Custom CSS in WordPress or your theme, and finally select "No styling" in the accordeon widget. The absolutely best choice for performance freaks - improves your ranking on Google PageSpeed Insights! Knocks the stuffing out of bloated products with more users and reviews - small is beautiful.

It's super powerful and worth every minute of time to learn how to use them all!

Had some minor issues and the developer fixed it almost instantly. It does exactly what I want and offers plenty of options to style it, or not. Its very flexible and thats why I use this plugin instead of the other big ones. I use it to collect links in a very tidy way in my sidebar. 5 stars from me.

I needed to replicate a vertical sidebar menu on my client's previous site, which they wanted to carry on to their new site. This plugin's easy customizability made it a snap. I did have to write a bit of custom css for positioning and separator lines, I think because my theme's css was overriding some of the plugin's settings. Thanks for the great plugin!