WordPress plugins by Scott Reilly

Disable the built-in front-end search capabilities of WordPress.

Adds links to navigate to the next and previous posts when editing a post in the WordPress admin.

Easily define additional CSS (inline and/or by URL) to be added to all administration pages.

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

Obfuscate email addresses to deter email-harvesting spammers.

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

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

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

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

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

Independently control the number of posts listed on the front page, author/category/custom post type/custom taxonomy/tag archives, search results, etc …

Interface for easily defining additional JavaScript (inline and/or by URL) to be added to all administration pages.

Reveal the theme template file used to render the displayed page, via the admin bar, footer, widget, shortcode, and/or template tag.

Automatically add links to words or phrases in your posts.

A widget that can act as a duplicate of another widget (for synchronized use in another sidebar)

Prevent specified posts from being featured on the front page or in feeds, and from notifying external services of publication.

Use widgets, shortcodes, and/or template tags to easily retrieve and display custom field values for posts or pages.

Customize the WordPress admin pages by selectively removing interface elements on a per-user basis.

Removes the WordPress update nag that appears at the top of all admin pages when a new version of WordPress is released.

Prevent WordPress from converting single and double quotation marks into their curly alternatives.

Display Recent Posts, Recently Commented Posts, Recently Modified Posts, Random Posts, and other post listings using the post information of your choosing in an easily customizable manner. You can narrow post searches by specifying categories and/or authors, among other things.

Template tags (for use in single.php) to create post navigation loop (previous to first post is last post; next/after last post is first post).

Extract a listing of data for all commenters (email addresses, names, URLs), and an option to export that data as a CSV file.

Display the time according to your blog via an admin toolbar widget, a sidebar widget, and/or a template tag.

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

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

Preserve formatting of code for display by preventing its modification by WordPress and other plugins while also retaining whitespace.

Prevent broken shortcodes from appearing in posts and pages.

Adds links to 'All Drafts' and 'My Drafts' under Posts, Pages, and other custom post type sections in the admin menu.

Restrict the usernames that new users may use when registering for your site.

Admin widget on the Add/Edit Post pages for inserting HTML encodings of special characters into the post.

Displays a count of each commenter's total number of comments (linked to those comments) next to their name on any admin page.

Admin dashboard widget (and optional daily email) that lists posts published to your site on this day in years past.

Adds the ability to update a post without having WordPress automatically update the post's post_modified timestamp.

Use widgets, shortcodes, and/or template tags to easily retrieve and display custom field values for users.

Display an image for each category associated with a post.

Prevent virtual directory listing services from listing the contents of directories, and/or show a page in place of a directory's listing.

Records the IP address of the original post author when a post first gets created.

Allows for more existing custom field names to be listed in the dropdown selection field when writing a post.

Retrieve the name, path, or link to a randomly chosen file or files in a specified directory.

Allows users to opt into receiving a notification email whenever a comment is made to the site.

Adds the ability to publish a post without triggering pingbacks, trackbacks, or notifying update services.

Display image (if present) and/or name for the author of a post, or for all authors on the blog.

Define a master post password that works for all passworded posts, while permitting the original post passwords to also work.

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

Easily create a link to another post using a shortcode to reference the post by id or slug; the link text is the post's title, unless overridden.

Never moderate or mark as spam comments made by registered users, regardless of the apparent spamminess of the comment.

Track which user actually published a post, separate from who created the post. Display that info as a column in admin post listings.

Enables in-place expansion of excerpts in the admin dashboard 'Comments' section of the 'Activity' widget to view full comments.

Turn a string, list, or array of tag IDs and/or slugs into a list of links to those tag archives. Provides a widget and template tag.

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

Turn a string, list, or array of category IDs and/or slugs into a list of links to those category archives. Provides a widget and template tag.

Control the number of posts per page, pages per page, and comments per page that appear in the admin listings of posts, pages, and comments.

Removes the browser nag that appears in the admin dashboard when using a less-than-current web browser.

Records which user trashed a post and when they trashed it. Displays that info as columns in admin trashed posts listings.

Allow an admin user (when logged in) to always be able to comment on a post, even if comments are closed for the post.

NOTE: WordPress 4.5 incorporated the functionality of this plugin and thus it is no longer needed unless you're still running an older version of …

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

Safely and easily call functions that may not be available (such as those provided by a plugin that gets deactivated)

Hide (so no one, or only users above a certain userlevel, can see) or cut (so only viewable on post's permalink page) portion(s) of post text. Link text for cuts can be defined per-cut or omitted, and if used, cut links are uniquely anchored. Quicktag buttons for the new tags facilitate use (but can be disabled).