Pulno - SEO Audit and Website Analysis. Pull up your SEO.
Meta Hunt - Everything you ever wanted to know about Product Hunt
LinkChecker - LinkChecker is a free, GPL licensed website validator.
Product Runt - A dynamic list of the bottom 100 projects on Product Hunt
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Product Hunt Leaderboard - The top products, hunter and makers.