pantsonhead

Activity Sparks is a highly customizable widget to display a “sparkline” style graph in your sidebar indicate post and/or comment activity. This plugin leverages Google’s Chart API, so does not require the PHP GDI library. Customization options include Title, size, colour, background transparency, caching period, activity granularity and period.

Activity Sparks

Display a customizable sparkline graph of post and/or comment activity.

andrefarzat

This plugin is for quick inclusion of interactive Plotly graphs within your WordPress blog. 
It works the same way as YouTube embeds — All you have to do is paste the link to your Plotly graph into WordPress and the interactive graph will appear. 
For example, paste http://plot.ly/~chris/1638 into the WordPress editor, and the graph with this URL will be displayed.

Activity Sparks vs Plotly