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.
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
Fire Hunt - Discover product launches from all over the web at one place
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.
Gone - An ephemeral to-do list