1. 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.

  2. BL

    BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.

  3. JSter is a community-driven catalog of the most useful javascript libraries.

  4. Browse new startups, and submit your mobile app/games startup's beta page here.