Matteo Barbero

This plugin automatically searches for native tags within the post content and adds a hashtag symbol before each one. It then links the tags to their respective tag archives, which can be useful for digital newspapers and magazines. With this plugin, you can easily turn your WordPress tags into hashtags, making your content more discoverable and shareable on social media.
The plugin comes with several customization options. You can change the default hashtag symbol used by the plugin, as well as the color of the links. You can also modify the plugin behavior through the settings panel, allowing you to fine-tune the plugin to your needs.
<h3>Features</h3>
<ul>
<li>Automatically add hashtag symbol to native tags in post content</li>
<li>Link tags to their respective tag archives</li>
<li>Customize hashtag symbol and link color</li>
<li>Settings panel for advanced customization</li>
</ul>

Hashtags for WordPress

This plugin automatically turns native WordPress tags into hashtags, linking them to their respective tag archives. You can customize the hashtag symb …

Artifakt Digital

The artifakt Hashtag Plugin allows you to easily and quickly make keywords 
searchable across your website, in the same way it does on other websites where 
hashtags are used. Just adding the # symbol in front of a word or phrase makes 
it a link to the archive page of that hashtag.
Originally this plugin simply created links to a search results page for the 
hashtags, and that worked well but we got to thinking about SEO and how it 
would be nice to index the hashtags on your site. So we created a custom taxonomy 
“Hashtags” (duh) so now you have some options on how you display the archive 
pages and the SEO meta for the pages (if you are so inclinded). You could even 
create a tag cloud of all your hashtags using WordPress’ tag cloud widget.
We are leaving all the customizing of the archive pages and SEO work up to you 
and your theme but your options are much more plentyful since version 2.0
Have fun! And as always, please let us know if there are any issues or 
features you’d like to see.

The artifakt Hashtag Plugin

This plugin makes #hashtagged keywords searchable across your website.

Hashtags for WordPress vs The artifakt Hashtag Plugin