Below is a list of WordPress plugins that I find I use over and over again. Posting it here for my own future reference as much as for sharing it.
Easily hide your WordPress site from public viewing by requiring visitors to log in first. Activate to turn on.
Plugin Download Page: https://wordpress.org/plugins/wp-force-login/
Admin Custom Login
Customize Your WordPress Login Screen Amazingly
Plugin Download Page: https://wordpress.org/plugins/admin-custom-login/
About Me is a sidebar widget that displays icon links to your profile pages on other social networking sites. Forked from Social Links.
Plugin Download Page: https://wordpress.org/plugins/about-me/
Plugin Download Page: https://wordpress.org/plugins/cookie-notice/
Disable all RSS/Atom feeds on your WordPress site.
Plugin Download Page: https://wordpress.org/plugins/disable-feeds/
Enables Google Analytics on all pages.
Plugin Download Page: https://wordpress.org/plugins/googleanalytics/
Disqus Comment System
The Disqus comment system replaces your WordPress comment system with your comments hosted and powered by Disqus. Head over to the Comments admin page to set up your Disqus Comment System.
Plugin Download Page: https://wordpress.org/plugins/disqus-comment-system/
Draw and edit flow charts, diagrams, images and more while editing a post.
Plugin Download Page: https://wordpress.org/plugins/drawit/
Adding iframes to your posts.
Plugin Download Page: https://wordpress.org/plugins/iframe/
Embed beautiful and feature-rich tables into your posts and pages, without having to write code.
Plugin Download Page: https://wordpress.org/plugins/tablepress/
Jetpack by WordPress.com
Bring the power of the WordPress.com cloud to your self-hosted WordPress. Jetpack enables you to connect your blog to a WordPress.com account to use the powerful features normally only available to WordPress.com users.
Plugin Download Page: https://wordpress.org/plugins/jetpack/
Better WordPress Google XML Sitemaps
Generates XML sitemaps for your WordPress website with ease. This plugin comes with support for sitemap index, multisite WordPress and Google News sitemap. It also provides a powerful and flexible system for any customization need.
Plugin Download Page: https://wordpress.org/plugins/bwp-google-xml-sitemaps/