What are some alternatives?
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
SEO Crawler - A web-based crawler with real-time crawl feedback.
Deepcrawl - Hosted SEO spider to analyze and find problems with websites.
ContentKing - The world's only Real-time SEO Auditing and Content Change Tracking suite.
SEOmator - SEO website analysis & audit tool