Siftery - Share products your company uses and get personalized recommendations
Product Comparisons - Compare any 2 software products
Stackshare - StackShare is a comprehensive website that gives its users the chance to organize and share their technology stack with the rest of the community.
TestBox - Test drive your software options before you buy
WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.
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.