Plugins that facilitate email marketing and managing subscriber lists

Plugins that help optimize content for search engines to improve visibility and rankings

Plugins that enable creating surveys and polls, and displaying results

Plugins that enhance default commenting, including spam protection and social integration

Plugins that enable running ads, or inserting ads from a third party service

Plugins that enable donations as a method of generating revenue

Plugins that enable paid subscriptions, including some services that are not WordPress-specific

Plugins that track and report website traffic and user behavior

Plugins that enable easy sharing of content on social media platforms

Plugins that help manage various aspects of content creation, organization, and display

Plugins that enable the creation and display of forms, as well as managing form data

Themes that determine the overall look and feel, often with additional functionality and plugins

Plugins that enhance site speed, including caching and image optimization

Plugins that provide security features to protect from threats and vulnerabilities

Plugins that create backups to prevent data loss and enable recovery