SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
One Hour Indexing - One Hour Indexing is a powerful, automated service that indexes and pings your backlinks. It's 100% Google safe and gives guaranteed ranking results
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
Google Structured Data Testing Tool - Google Structured Data Testing Tool
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.
Ahrefs - Ahrefs is a toolset for SEO and marketing. We have tools for backlink research, organic traffic research, keyword research, content marketing & more. Give Ahrefs a try!