PitchWall - Browse new startups, and submit your mobile app/games startup's beta page here.
Startup Stash - A curated directory of 400 resources & tools for startups
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
Startup Buffer - Startup Buffer is a premium startup directory for emerging startups all around the world.
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.
Makerbook - A directory of the best free resources for creatives