Widget Logic lets you control on which pages widgets appear using WP’s conditional tags. It also adds a ‘widget_content’ filter.

WooCommerce is a powerful, extendable eCommerce plugin that helps you sell anything. It has a lot of third-party extensions, some for free and some not.

WordPress ReCaptcha Integration integrates Google reCaptcha in your blog. Supports no Captcha as well as old style recaptcha. Provides of the box integration for signup, login, comment forms, Ninja Forms and Contact Form 7 as well as a plugin API for your own integrations.

WordPress SEO by Yoast improves SEO (Search Engine Optimization) by writing better content and fully optimizing your WordPress site.

WP Maintenance Mode adds a splash page to your site that you can activate for your visitors when your site is down for maintenance. It’s also perfect for a coming soon page.

WP-Optimize is a simple but effective plugin allows you to extensively clean up your WordPress database and optimize it without doing manual queries.