SEO Crawler - A web-based crawler with real-time crawl feedback.
Majestic - Majestic - Link intelligence tools for SEO and Internet PR and Marketing. Site Explorer shows inbound link and site summary data.
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
Scrapy - Scrapy | A Fast and Powerful Scraping and Web Crawling Framework
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.