BenchPress

Open source

BenchPress is a generic framework for load testing NoSQL databases. It allows you to tailor the benchmarking to the type of load realisitic for your problem—from the rate and size of requests to the structure of each.

Powergremlin

Open source

Powergremlin helps iOS developers analyze power usage (for iOS 6 devices) with more granularity and accuracy than Apple's own Instruments.