elightbo

This twitter plugin outputs your twitter updates to your WordPress blog. It linkifies hash tags and @replies while properly caching. It is called TweetiePie because it uses the <a href="https://wordpress.org/extend/plugins/simplepie-plugin-for-wordpress/" title="SimplePie" rel="ugc">SimplePie WordPress plugin</a> to pull the tweets from twitter and cache them. Caching is necessary to minimize the times that your blog has to talk to twitter. This will speed up your site and <a href="http://apiwiki.twitter.com/Rate-limiting" title="Rate limiting on twitter" rel="nofollow ugc">keep twitter happy</a>.
This plugin requires WordPress 2.8 or greater. If using an earlier 2.8 version it also requires the <a href="https://wordpress.org/extend/plugins/simplepie-plugin-for-wordpress/" title="SimplePie" rel="ugc">SimplePie WordPress plugin</a>.

TweetiePie

Outputs latest twitter updates and linkifies hash tags and @replies.  Properly caches.

Keisuke Nemoto

Adds a sidebar widget to display Twitter profiles.
Separated by commas multiple screen names, you can view multiple profiles in this widget.

Twitter Profile Widget

Adds a sidebar widget to display Twitter profiles.

TweetiePie vs Twitter Profile Widget