Plugins on this list:
Move or copy a WordPress site to another server or to another domain name, move to/from local server hosting, and backup sites.
Widget Logic lets you control on which pages widgets appear using WP's conditional tags. It also adds a 'widget_content' filter.
Backup and restoration made easy. Complete backups; manual or scheduled (backup to S3, Dropbox, Google Drive, Rackspace, FTP, SFTP, email + others).
This plugin will generate a special XML sitemap which will help search engines to better index your blog.
Limit rate of login attempts, including by way of cookies, for each IP. Fully customizable.
This plugin blocks distributed botnet brute-force attacks on your Wordpress installation.