Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.
Product Hunt Leaderboard - The top products, hunter and makers.
Fast Link Checker - An advanced tool to find broken links on web sites.
Personal Hunt - Your personal Product Hunt leaderboard
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
Meta Hunt - Everything you ever wanted to know about Product Hunt