remm

This plugin provide widget that display a list with categories and posts in your sidebar. 
Widget can save the opened categories, and use cache.

Wp Ajax Tree

This plugin provide a widget that display a category and pages tree on your sidebar, using ajax to collapse categories.

Seth Carstens

sethmatics

Do not activate if you have more then 5,000 pages. For issues please use github issues: <a href="https://github.com/WordPress-Phoenix/sm-dashboard-pages-navigator-tree/issues" rel="nofollow ugc">github.com/WordPress-Phoenix/sm-dashboard-pages-navigator-tree/issues</a>
Navigate your pages, with labels for private and pending, in a nice page tree heirarchy sitemap on the admin dashboard provided by <a href="https://sethcarstens.com" rel="nofollow ugc">Seth Carstens</a> and <a href="http://sethmatics.com/" rel="nofollow ugc">Sethmatics</a>.
Features include:
<ul>
<li>open all page link (enables you to ctrl+f find any page)</li>
<li>much faster workflow to navigate to your pages</li>
</ul>
Don’t forget to rate our plugin so we know how we are doing!

SM Dashboard Pages Navigator Tree

Navigate all your pages, with labels for private and pending, in a nice page tree hierarchy on the admin dashboard.

Wp Ajax Tree vs SM Dashboard Pages Navigator Tree