Some Wordpress plugins are often updated, which is good think. Plugins that are updated are 100% compatible with last Wordpress version and they also are the most secure possible. A plugin that has not been updated for a long time might not work with last Wordpress version and might create a security breach for you website.
Restrict access to readers who login with a permitted email addresses (no usernames or passwords!). Ideal for private/personal/family blogs.
Group recent posts by category and show them inside boxes organized to columns.
BuddyPress Activity Privacy plugin add a privacy level to activity stream component.
Puts the site into maintenance mode by sending a '503 Service Unavailable' status to all unauthenticated clients.
A simple and intuitive, yet elegant and fully documented Google map plugin that installs as a widget and a short code.
A Simple Calendar add-on to display your WordPress blog posts in a calendar view.