Product Hunt - A website that lets users share and discover new products
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.
Betafy - Where startups meet beta users!
Alternative.me - Welcome to alternative.me, the source of better software alternatives. Finding suitable software was never easier.
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
Beta Family - 50,000 testers to test your app