Graphiq - Vivid, contextually-rich visualizations of the world's deepest knowledge graph.
Productz.com - Crowdsourced products database
Diffzi - Diffzi.com lets you compare anything.
Virus Bulletin - Virus Bulletin is a security information portal, testing and certification body with a formidable...
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.
AwesomeSearch - A search engine aggregating multiple Awesome-lists, which are curated lists of software related projects, mostly on Github.