Betafy - Where startups meet beta users!
Check a Site - Scan websites for over 700 quality problems
Beta Testers Hub - Early adopters network for your Startup
Beta Family - 50,000 testers to test your app
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks