Eduardo Reveles

Convert the following formats:
<ul>
<li>@username -> http://twitter.com/username</li>
<li>@username/listname -> http://twitter.com/username/listname</li>
<li>#hashtag -> http://search.twitter.com/search?q=%23hashtag</li>
</ul>
It comes with some options to configure, like use nofollow attribute, open on a new page and choose where you want the links to be replaced.

Twitter Highlight

Convert twitter usernames, hashtags and lists in pages, posts or comments to a twitter link.

Michael Uno

miunosoft

This is a <a href="https://wordpress.org/plugins/fetch-tweets/" rel="ugc">Fetch Tweets</a> template that creates a hashtag cloud from the fetched tweets.
It can be displayed as a list.
<h4>Notes</h4>
In order to use this template, <a href="https://wordpress.org/plugins/fetch-tweets/" rel="ugc">Fetch Tweets</a> needs to be installed and activated.

Fetch Tweets – Hashtag Cloud

Extracts and displays only hastags from the result of Fetch Tweets.

Twitter Highlight vs Fetch Tweets – Hashtag Cloud