Dead Link Checker - Check for broken links on any website
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
Product Hunt - A website that lets users share and discover new products
LinkChecker - LinkChecker is a free, GPL licensed website validator.
Betatesters.io - The platform connecting mobile developers and beta testers