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 …

dyerware

This plugin allows you to easily insert charts into your blog, by way of shortcodes. While multipurpose, the chart system is intended to make it easy for posting detailed review measurements of some sort, such as poll data, video card comparisons, sports scores, etc. You specify the names of the devices being measured, the tests performed, and each device’s measurements for said test.
An admin settings page allows you to tailor many shortcode defaults, simplifying overall use.
The shortcode is supported on posts, pages, and in widgets.
Graphs scale to meet the size of the end-user client display, and support mobile displays such as those rendered by the wptouch plugin.
Charts supported are horizontal bar, stacked horizontal bar, vertical bar, stacked vertical bar, line graph, and pie. More can be added if desired.
PHP5 Required.
The shortcode format is:
[easychart argument=”value” …]
For a complete example and more detailed documentation, visit the plugin home page. If you do not understand these instructions, please ask questions in the comments section on the plugin home page. We will be more than happy to answer them.
Go here for up-to-date usage and examples: 
<a href="http://www.dyerware.com/main/products/easy-chart-builder/easy-chart-builder-plugin-for-wordpress.html" title="EasyChart Tutorial" rel="nofollow ugc">EasyChart Tutorial</a>

Easy Chart Builder for WordPress

This plugin allows you to easily create charts within your blog by use of shortcodes.

Post Volume Stats vs Easy Chart Builder for WordPress