Disable Directory Listings

Force browsers to display two spaces (when present) between sentences.

Prevent broken shortcodes from appearing in posts and pages.

Reduce permalinks (category or post) that include entire hierarchy of categories to just having the lowest level category.

Force a single admin color scheme for all users of the site.

Check if a file exists and return true/false or display a string containing information about the file.

Allows users to hide inline documentation and help text that are geared for beginning users in the WordPress admin.

Allow multiple user accounts to be created, registered, and updated having the same email address.

Configure SMTP mailing in WordPress, including support for sending email via SSL/TLS (such as Gmail).

Conveniently close or open comments for a post or page with one click from the admin listing of posts.

Have "Remember Me" checked by default on the login page and configure how long a login is remembered. Or disable the feature altogether.

Replace text with other text. Handy for creating shortcuts to common, lengthy, or frequently changing text/HTML, or for smilies.

Add hover text (aka tooltips) to content in posts. Handy for providing explanations of names, terms, phrases, abbreviations, and acronyms.