BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
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
Betatesters.io - The platform connecting mobile developers and beta testers
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks