Broken Links at a Glance – Free online broken link checker for small web sites (up to 1000 pages), by Hans van der Graaf.
Checkerr – Simple website tester/link checker from GardeMatic Ltd. Start from a dashboard and drill down to any errors. Every error is represented as an error card, with help inline; includes broken link highlighter. Free and $$ plans available; Free plan includes up to 20,000 URLs, delayed manual tests, email alerts upon test finish.
LinkTiger – Hosted link checker; free and $pro versions. Capabilities include e-mail alerts, dashboard, reporting; canned reports or create rich custom reports. Scans PDF, CSS, Flash and MS Office files, flash-animation.
Link Checker Pro – Downloadable link check tool from KyoSoft; can also produce a graphical site map of entire web site. Handles HTTP, HTTPS, and FTP protocols; several report formats available. For Win platforms.
Web Link Validator – Downloadable link checker from REL Software checks links for accuracy and availability, finds broken links or paths and links with syntactic errors. Export to text, HTML, CSV, RTF, Excel. Freeware ‘REL Link Checker Lite’ version available for small sites. For Windows.
Site Audit – Low-cost on-the-web link-checking service from Blossom Software.
Xenu’s Link Sleuth – Downloadable freeware link checker by Tilman Hausherr; supports SSL websites; detects and reports redirected URL; Site Map; for Windows.
Linkalarm – Low cost on-the-web link checker from Link Alarm Inc.; free trial period available. Automatically-scheduled reporting by e-mail.
Alert Linkrunner – Downloadable link check tool from Viable Software Alternatives; evaluation version available. For Windows.
CyberSpyder Link Test – Downloadable link checker app by Aman Software; capabilities include specified URL exclusions, ID/Password entries, test resumption at interruption point, page size analysis, ‘what’s new’ reporting. For Windows.
W3C Link Checker – Link checking service run by the WWW Consortium (the folks who set web standards); configurable. Handles one URL at a time. PERL source also available for download.
Big Brother – Open source command-line link checker for Unix, Windows, by Francois Pottier. Available as source code; binary available for Linux.
LinkLint – Open source Perl program checks local/remote HTML links. Includes cross referenced and hyperlinked output reports, ability to check password-protected areas, support for all standard server-side image maps, reports of orphan files and files with mismatching case, reports URLs changed since last checked, support of proxy servers for remote URL checking. Distributed under Gnu General Public License. Has not been updated for many years.
(Note: Many of the products listed in the Web Site Management Tools section include link checking capabilities.)