StartupBase - Community of makers & early adopters
Product Hunt - A website that lets users share and discover new products
PitchWall - Browse new startups, and submit your mobile app/games startup's beta page here.
Launching Next - Showcasing the world's most promising new startups every day
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
SaasGenius - SaasGenius lets you find the right software for your business.