stanton119

WordPress HTML allows you to add custom HTML to both the post/page BODY and the HEAD tags from the page editor.
When copying HTML into the WordPress editor it adds spurious tags which break various elements and corrupt the HTML. By saving the HTML in the custom fields dialogue the exact HTML will be output to your post/page.
Also if you have a single page which requires an extra javascript library or style sheet you normally have to add it through your themes php files. Updating the theme files can be a pain; we normally have to set up an exception for that individual page and load it there. As this information is not available when we are editing the actual pages in the WordPress editor it is quite obstructive.
With WordPress HTML, we can add the library or stylesheet directly to the post/page head without the need to change the theme files. And importantly, all from within the WordPress editor for that page.
Example libraries: 
jQuery, ChartJS, D3js, Highcharts, Prototype
More details: <a href="http://www.richard-stanton.com/wordpress/wordpress-html/" rel="nofollow ugc">WordPress HTML</a>
Code: <a href="https://github.com/stanton119/WordPress-HTML-Plugin" rel="nofollow ugc">GitHub</a>

WordPress HTML

Add raw HTML to any post/page, without the Wordpress editor breaking it.

methnen

Allows you to manage data sets via a spreadsheet interface and present that data in chart form via the Chart.js or <a href="https://github.com/methnen/m-chart-highcharts-library/" rel="nofollow ugc">Highcharts</a> chart libraries. The charts can then be embedded into a regular post via a handy shortcode.
Note: Starting with version 1.8 the Chart.js library is no longer on the 2.x.x branch which introduces some <a href="https://www.chartjs.org/docs/latest/getting-started/v3-migration.html" rel="nofollow ugc">breaking changes</a>. This will probably only affect you if you were modifying the default Chart.js behavior in some way.
Note: Starting with version 1.7 Highcharts is no longer included with this plugin by default. If you’d still like to use the features that require Higcharts please install the <a href="https://github.com/methnen/m-chart-highcharts-library/" rel="nofollow ugc">M Chart Highcharts Library</a> plugin before installing this update.
For full documentation please see the <a href="https://github.com/methnen/m-chart/wiki" rel="nofollow ugc">Wiki</a>.
To contribute, report issues, or make feature requests use <a href="https://github.com/methnen/m-chart" rel="nofollow ugc">Github</a>.

M Chart

This plugin fits my needs for creating beautiful and responsive charts on my WordPress. Thanks for your work!

Great support and nicely done!

Manage data sets and display them as charts in WordPress.

WordPress HTML vs M Chart