shooflydesign

This plugin can override the Authors metabox on the post add/edit screen, letting users who can edit other people’s posts, reassign a post to others user on the site.
This is especially useful in situations where you’ve created custom user roles that WordPress doesn’t recognize as Authors. If you want to allow your content editors and administrators to assign new or existing content to anyone, you’ll (hopefully) like this plugin very much indeed.
On WordPress 5.0, the metabox will appear below the main block editor (see screenshot). I will be supporting updates to the Status & Visibility box as soon as possible.
I’m not sure how far back this plugin will work, I’m saying it requires 3.5 or greater — it was originally developed using WordPress 4.1.
(Inspired by <a href="https://core.trac.wordpress.org/ticket/18645" rel="nofollow ugc">this trac ticket</a>)

Better Author Metabox

Lets you safely override the built-in Author metabox with one that includes more users.

iosoft

ayandebnath

Many times, while maintaining a WordPress website, we need to find basic statistics like user registrations or user comments and also compare them with different years. It can generate Bar-Diagram or Line-Diagram for different years and different months for the no of users registrations and no of users comments posted in the website.
This plugin is very light-weight, just 10kb, and it uses Google Charts API only where it is needed.

Mini Statistics

This plugin is a small and simple Users Statistics and Comments Statistics plugin for WordPress.

Better Author Metabox vs Mini Statistics