Geekbench is available for Linux, Mac OS X, and Windows, letting you compare performance across different hardware configurations and operating systems with ease.
Geekbench 2.0.7 adds support for Mac OS X 10.5 (Leopard) and adds 64-bit benchmarks for Mac OS X (provided, of course, you’re running Leopard). Geekbench 2.0.7 also fixes a number of issues under Linux.
Tools and Utilities
Windows, Mac Linux
Product page: here