Performance checkers: What tools are available for attaining the metrics necessary to perform a performance review? Bench-marking is often not easily done by hand after all.

This is a follow-up to this question about formatting and error checking tools.

Tools listed here should help getting metrics for questions with performance (info). Speed and time-complexity, memory usage, hang-ups, etc.

Preferably people should run these tools before posting their code on Code Review. However, since not everyone will follow this advice, feel free to use these tools in the reviewing process if required.

Post at least the name of the tool, the official website and the languages targeted by the tool. Free tools are preferred, make sure to add a note if your tools is paid/commercial.