Screaming Frog SEO Spider is a famous website links detecting tool developed by Screaming Frog from England. It can quickly grab, analyze and test all URLs, inlinks, outlinks, images, CSS, scripts, SERP Snippet and other elements on a website.
Broken/dead links on a website are a big problem for both visitors (result in bad user experience or misleading) and webmasters (seriously affect the SEO scores). For large sites, to find out all these links manually can be a nightmare.
Xenu's Link Sleuth is a well received by industry and widely used utility designed for searching and checking the validity of all links on a website or in a file. It may be the smallest but most powerful and very simple to use broken links checker you have seen.