What are some alternatives?
When comparing SEO Crawler and Screaming Frog SEO Spider, you can also consider the following products
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
Seodity - The complete SEO toolkit for improving your projects.
ContentKing - The world's only Real-time SEO Auditing and Content Change Tracking suite.
Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.