GSMArena - GSMArena is an online site that offers exhaustive and up and coming cell phone data.
Graphiq - Vivid, contextually-rich visualizations of the world's deepest knowledge graph.
NanoReview - Most advanced CPU and SoC comparison
vsChart.com - With vsChart.com you can compare products and a lot more.
Versus - Find popular alternatives to anything in a jiffy
Diffzi - Diffzi.com lets you compare anything.