Plugins on the list:

Just another contact form plugin. Simple but flexible.

Categories: Forms

Improve your WordPress SEO: Write better content and have a fully optimized WordPress site using the Yoast SEO plugin.

Categories: Seo

Search Engine (SEO) & Performance Optimization (WPO) via caching. Integrated caching: CDN, Page, Minify, Object, Fragment, Database support.

Categories: General

Make email delivery easy for WordPress. Connect with SMTP, Gmail, Outlook, SendGrid, Mailgun, SES, Zoho, + more. Rated #1 WordPress SMTP Email plugin.

Categories: General

Smaller Images, Faster Sites, Happier Visitors. Comprehensive image optimization that doesn't require a degree in rocket science.

Categories: General

Check posts, pages & all content for broken links & missing images to improve SEO. Get notified when bad links are found.

Categories: General

Easily improve site security with WordPress hardening, vulnerability detection and SSL certificate generation.

Categories: General

Duplicate Posts, Pages and Custom Posts easily using single click

Categories: General

A powerful yet user friendly plugin that automatically creates a table of contents. Can also output a sitemap listing all pages and categories.

Categories: General

Sumo is trusted by over 600,000 businesses — small and large — in growing their email lists, customer base, and revenue online.

Categories: General

SEO Smart Links provides automatic SEO benefits for your site in addition to custom keyword lists, nofollow and much more.

Categories: General

Social media share buttons and social share icons for Twitter, Facebook, and other more. Highly customizable social media share button ecosystem

Categories: General

AMP for WP is the most recommended AMP plugin by the community. Automatically add Accelerated Mobile Pages (Google AMP Project) functionality on your …

Categories: General

Related posts for your WordPress site with inbuilt caching. Supports blocks, shortcodes, widgets and custom post types!

Categories: General

An admin interface to control the default comment and trackback settings on new posts, pages and custom post types.

Categories: General

Sets a cookie on a random URL that is then checked when a comment is posted. If the cookie is missing the comment is marked as spam.

Categories: General

Find quality CC0 Public Domain images for commercial use, and add them to your blog with just a click - attribution is voluntary.

Categories: General

Creates automatic redirects for 404 traffic and page suggestions when matches are not found providing better service to your web visitors.

Categories: General