pishmishy

This plugin compares a list of passwords against the user accounts in a WordPress blog, using the password hashing functions built into WordPress. It can be a useful tool for auditing your user’s choice of passwords. This plugin uses no functions or data not already available to other plugins, or administrators.
<h3>Getting Help</h3>
E-mail james@freecharity.org.uk

WordPress Password Cracker

Audit WordPress user passwords against a dictionary file.

Mads Phikamphon

Almost Users Only is a plugin that limits public access to your blog. Visitors that are not logged in can only view a specific public page. If they are trying to reach other pages they will automatically be redirected to the public page.
If a visitor is logged in, he can view all the pages/posts on the blog (just like if it were a normal WordPress installation).
The public page can for example be used to display information about the site and a guide to how visitors can get an account.
IMPORTANT: WordPress still publish RSS feeds, so posts can still be read that way. Pages should be save though.

Almost Users Only

If logged in, the visitor can view all the pages/posts on the blog. If not logged in, the visitor can only view a specific public page.

WordPress Password Cracker vs Almost Users Only