Check a Site - Scan websites for over 700 quality problems
Product Hunt - A website that lets users share and discover new products
Beta Family - 50,000 testers to test your app
Betafy - Where startups meet beta users!
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.