Product Hunt - A website that lets users share and discover new products
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
PitchWall - Browse new startups, and submit your mobile app/games startup's beta page here.
Startup Buffer - Startup Buffer is a premium startup directory for emerging startups all around the world.
StartupBase - Community of makers & early adopters
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.