Softpedia - A library of over 1,000,000 free and free-to-try applications for Windows, Mac, Linux and Smartphones, Games and Drivers plus tech-focused news and reviews
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.
MajorGeeks - Download freeware and shareware software utilities.
Product Hunt - A website that lets users share and discover new products
CNET Download.com - CNET is the premier destination for tech product reviews, news, price comparisons, free software downloads, videos, and podcasts.
osalt - Find open source software alternatives to well-known commercial software.