Majestic - Majestic - Link intelligence tools for SEO and Internet PR and Marketing. Site Explorer shows inbound link and site summary data.
SEO Crawler - A web-based crawler with real-time crawl feedback.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Brightedge - BrightEdge is the leading content performance marketing platform, helping more than 1,200 customers generate more organic traffic. BrightEdge is based in San Mateo, CA with offices in New York, Seattle, Chicago, Tokyo, Sydney, and London.
Scrapy - Scrapy | A Fast and Powerful Scraping and Web Crawling Framework