Provides a command line program and web interface to check links of websites and HTML documents. Features: * recursive checking * multithreaded * output in colored or normal text, HTML, SQL, CSV, XML or a sitemap graph in different formats * HTTP/1.1, HTTPS, FTP, mailto:, news:, nntp:, Telnet and local file links support * restrict link checking with regular expression filters for URLs * proxy support * username/password authorization for HTTP, FTP and Telnet * robots.txt exclusion protocol support * Cookie support * i18n support * HTML and CSS syntax check * Antivirus check