Betafy - Where startups meet beta users!
Product Hunt - A website that lets users share and discover new products
lucr - Get early adopters for your startup
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
Beta Family - 50,000 testers to test your app
Passmarked - Simple, all-in-one test to check the quality of your website