BrowserBench.org is a Free, open-source platform that provides browser benchmarks to measure different aspects of browser and computer hardware performance. It hosts three main benchmarks: JetStream 2.1, MotionMark, and Speedometer.

1. JetStream 2.1: This benchmark suite focuses on evaluating the performance of JavaScript and WebAssembly in the context of advanced web applications​.
2. MotionMark: Designed to assess the graphics systems of browsers, MotionMark measures a browser’s capability to animate complex scenes at a targeted frame rate​.
3. Speedometer: This benchmark gauges the responsiveness of web applications, using demo web applications to simulate user actions such as adding to-do items​​.

The benchmarks on BrowserBench.org are tailored to test varying functionalities, helping users to understand the performance and capabilities of different browsers and hardware systems in handling modern web technologies and graphics.