Button Reveal Sidebar Plugin

Quick question for the clever ones. ??
What is the technical term for a plugin with a slide function like this? I mean if i were to search for other plugins, with a button that, when pressed shows a sidebar like this

plugin:
https://codecanyon.net/item/ninja-kick-sidebar-contact-form/6598780?WT.ac=solid_search_thumb&WT.seg_1=solid_search_thumb&WT.z_author=thegleb

I love this plugin, but what i’m looking for is one that offers user posting, instead of a contact form.

It would be so awesome if some of you could point me in the right direction, been searching for half the day now ??
Thank you guys!