Yoast

Keywords Everywhere is a browser extension that provides search volume data, CPC, and competition data for keywords on websites such as Google Search, Google Analytics, YouTube, Amazon, and more.

AlsoAsked is an SEO tool that helps users identify and analyze the "People Also Asked" (PAA) feature on Google search results.

WordTracker is a keyword research tool that helps website owners, content creators, and online marketers find the best keywords to target in their SEO and PPC campaigns.

SpyFu is a powerful tool designed to help businesses and digital marketers conduct keyword research, track their competitors' online marketing activities and discover new growth opportunities.

Surfer is an SEO tool designed to help website owners, digital marketing agencies, and SEO professionals optimize their website content for search engines.

Seobility is an SEO (Search Engine Optimization) software and website crawler tool that helps businesses and website owners optimize their websites for better search engine rankings.

Find and organize thousands of long tail keywords from many sources for free.

Keyword Hero is a software tool designed to help website owners and digital marketers understand the keywords that drive traffic to their site.

BuzzStream is an end-to-end outreach platform that helps you stay organized and grow your digital PR and link building results, whether you’re a team of one or one hundred.

Answer the Public is a free online tool that helps you create content that will lead to traffic and sales on your site.