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.
Product Hunt - A website that lets users share and discover new products
Alternative.me - Welcome to alternative.me, the source of better software alternatives. Finding suitable software was never easier.
Free Software Directory - The Free Software Directory is a project of the Free Software Foundation (FSF) and United Nations...
Filehippo - Filehippo is your key to opening files that Windows claims are "in use by another user" or simply "can't be found." Avoid the hassle.
SaaSHub - Find and promote software that will help you grow your business or to be more productive.