LinkBoss

SEO Tool Lab

Pitchbox

Answer Socrates

SERP Simulator

URL Extractor

Schema.org

AnswerThePublic

Seomator

Ubersuggest's Free Keyword Tool

KWFinder

cognitiveSEO

Ahrefs

SEMrush

Screaming Frog

SEOquake

SEO PowerSuite

SeoSiteCheckup.com

WebPagetest

Moz