Graphiq - Vivid, contextually-rich visualizations of the world's deepest knowledge graph.
Versus - Find popular alternatives to anything in a jiffy
vsChart.com - With vsChart.com you can compare products and a lot more.
Kimovil - Compare price, specs, reviews and benchmarks for smartphones and tablets.
Diffzi - Diffzi.com lets you compare anything.
GSMArena - GSMArena is an online site that offers exhaustive and up and coming cell phone data.