mihai-rotaru

Simple plugin which wraps a Twitter widget as a WordPress widget.
In order to use it, you need the Twitter widget’s ID – something like 
332108549298064896. You can see it in the embeddable code Twitter gives you 
after you create the widget. You also need the Twitter username for the account 
the widget belongs to.

Proper Twitter Widget

Makes available a widget which contains a Twitter feed.

Simivar

Adds a sidebar widget to display Twitter updates (using the Javascript). You can set number of messages, color and other features.
You can change colors of shell background and shell text; tweet background, tweet text and tweet link. You can set on/off a features like scrollbar, show hashtags, poll for new results, show timestamps/avatars and the behavior.

Advanced Twitter Profile Widget

Adds a sidebar widget to display Twitter updates (using the Javascript). You can set number of messages, color and other features.

Proper Twitter Widget vs Advanced Twitter Profile Widget