Voglperf is a quick Valve tool for benchmarking Linux OpenGL games that comes down to just spewing frame information (FPS, frame time and min/max values) every second. That data can then be plotted, etc. Voglperf doesn't integrate any test automation but just dumps the frame data for whatever OpenGL game/application is loaded by it. Voglperf is supported on SteamOS and works with Steam on Linux.
In making it easier for packaging by distributions, the initial release of Voglperf happened on Tuesday. The initial release was tagged voglperf 0.1. Voglperf isn't to be confused with Valve's full-on VOGL OpenGL debugger for Linux game developers.
On a semi-related note, we added new Steam Linux benchmarks and have already run a new 15-way NVIDIA vs. AMD Source Engine GPU comparison on Ubuntu 14.04 Linux.