Product Hunt - A website that lets users share and discover new products
Rayst - Reveal the company, stat, tech stack of any website.
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.
SR Company Tech-Stack - Find all the technologies used by a company
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
Sales.Rocks - Full Sales Enablement & Automation platform and real-time Company Data.