SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Soovle - Soovle is a customizable search engine provides the search suggestion of the best provider on the net.
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
Google Trends - Explore Google trending search topics with Google Trends.
Website Checker Tech - WebsiteChecker.Tech is SaaS tool that detects SEO and availability issues of your website, making it easier for you to fix them.
Moz Analytics - Moz Analytics is the most popular SEO (Search Engine Optimization) tool that uses both basic and advanced research tools to enhance your traffic.