Mark (podz)

This Twitter plugin allows you to publish your latest twitter updates as a widget on your blog.
You can select how many updates you wish to publish on your website, including options to make URLs into hyperlinks, replies into hyperlinks and even showing your profile picture!

My Tweets

This Twitter plugin allows you to publish your latest twitter updates as a widget on your blog.

FuzzGuard

This plugin allows you to display widget items based on if a user is logged in, logged out or based on the role you have given the user.
This plugin allows fine-grained permissions to be added to each individual widget item to display or not display the item based on the 
 users logged in/logged out status or the role assigned to the user. This solves the problem of having to modify theme functions.php files to add in widget restrictions. The changes in functions.php is often overwritten by a theme update. This plugin removes that worry, as you can update the theme, independent of the plugin.

Privilege Widget

This plugin allows you to display widget items based on if a user is logged in, logged out or based on the role you have given the user.

My Tweets vs Privilege Widget