Angelo Rocha

Features: 
– Lists available roles; 
– Add custom roles; 
– Delete custom roles; 
– Permissions based on custom roles; 
– User management; 
– Adds more than one role for a user; 
– Set default role for user without roles; 
– Access to admin menu by role; 
– Auto add role to new users; 
– Show/Hide admin bar to specific roles; 
– Show/Hide Widgets on admin/front to specific roles; 
– Show/Hide individual sidebar widgets to specific roles; 
– Content access by user role;

WPSS Ultimate User Management

This plugin allows efficient management of users, roles and capabilities. Create, edit and delete user permissions faster and easier.

andyexeter

Post Lockdown protects your site-critical pages and posts by disabling all non-admin users’ ability to trash or delete them. 
It can also lock pages and posts, which will disable editing of the post as well as disabling trashing/deleting.
The plugin adds a new options page under the Settings menu in your WordPress admin panel which allows you to quickly search and 
select for all pages and posts of any post type. When you find the item you want to select, simply click it to move it to the right 
box and click Save Changes.
See the screenshots for an example of what an Editor would see when they view a list of posts with some locked and protected.

Post Lockdown

Works very well, my only criticism is that private posts/pages should be lockable, ie private posts should appear in the search form.

In order to lock them currently you need to publish them, then lock/portect, and then make it private again

Update!! the developer added the minor feuature request/bug. This plugin is now perfect!

Now perfect

I think the plugin is really useful, otherwise I wouldn't have made it ;)

Great Plugin

Allows admins to protect selected posts and pages so they cannot be trashed or deleted by non-admin users.

WPSS Ultimate User Management vs Post Lockdown