Product Hunt - A website that lets users share and discover new products
LinkChecker - LinkChecker is a free, GPL licensed website validator.
Betafy - Where startups meet beta users!
DRKSpiderJava - DRKSpider is an open source website crawler (sitemap generator) and link checker. Features:
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.