shortdark

This plugin looks at the volume of posts in each category, tag, the volume of posts per year, month, day-of-the-month, day-of-the-week, hour, author, number of words-per-post and the number of days between posts. You can specify a year and/or an author to just look at the post volume stats for that year/author. The bar and pie charts can be added to a sidebar with Post Volume Stats widget. Lists and line graphs can be exported to a new post to show the change in category, tag and custom taxonomy posts over the years. You can also export the “Compare Years” data into a CSV spreadsheet. The latest feature is the “Date Range” page which applies a date range to the data on the main page.
Please let me know if you like this plugin by <a href="https://wordpress.org/plugins/post-volume-stats/" rel="ugc">leaving a review</a>.
Go to the <a href="https://www.postvolumestats.com/" rel="nofollow ugc">Post Volume Stats website</a> for more information.
<h4>Translations</h4>
You can translate Post Volume Stats on <a href="https://translate.wordpress.org/projects/wp-plugins/post-volume-stats" rel="nofollow ugc">translate.wordpress.org</a>.

Post Volume Stats

With dozens of authors and posts per day, this plugin gives a very nice overview of who does what and when.

Very nice plugin

Shows stats for the volume of posts per year, month, day-of-the-month, day-of-the-week, hour-of-the-day, words per post, days between posts, author, c …

jvrtanoski

Plugin that will allow the blog authors to add simple but effective geo-chart, bar-charts or line graphs in their blogs. 
The plug-in provides shortcodes for each chart type. The short codes can be placed anywhere in the text of the post/page 
and the plug-in will render the chart in the place of the short code. The data for the chart is placed in form of table 
insite the shortcode tag. For more details see the samples in the FAQ section. 
The charts are based on Google’s Javascript charts library, and the format of the data table is determined by the library itself. 
For more details see the help pages of the Google Chart library.

GoogleGraph

Plugin allows the blog authors to add simple but effective geo-chart, bar-charts or line graphs in their blogs using Google's Chart .js library.

Post Volume Stats vs GoogleGraph