VideoGL1 OpenGL Benchmarks - Roy Longbottom's PC benchmark Collection. Compares OpenGL performance on various GPUs. - http://homepage.virgin.net/roy.longbottom/opengl%20results.htm
OpenGL VBO Benchmarks - Benchmarks comparing OpenGL Display Lists and VertexBuffer Object benchmarks. Includes graphs. - http://www.sci.utah.edu/~bavoil/opengl/
GLBenchmark - Mobile OpenGL ES Benchmark - Featuring JBenchmark, for Java ME. Includes OpenGL benchmarks for various cellphones. - http://www.glbenchmark.com/index.jsp
OpenGL Performance on Windows Vista vs XP - An article on OpenGL.org describing Vista's OpenGL architecture and benchmarks comparing XP vs Vista. - http://www.opengl.org/pipeline/article/vol003_9/
POGL Multi-language Benchmarks - Compares OpenGL performance on C, Perl and Python - on Windows, Fedora and Ubuntu. Includes source code. - http://graphcomp.com/opengl/index.cgi?v=0111s3m3
OpenGL.org's Benchmark Resources - Overview and description of common OpenGL benchmark standards. - http://opengl.org/resources/benchmarks/
OpenGL Geometry Benchmark - Compares geometry lighting and shading performance on various GPUs. Includes source and Windows binaries. - http://www.fl-tw.com/opengl/GeomBench/
SPECopc Group - Develops Benchmarks for Systems Based on the OpenGL API. - http://www.spec.org/gpc/opc.static/overview.html
NVShaderPerf - Command line utility that reports shader performance metrics. DirectX and OpenGL shaders written in HLSL for NVIDIA GeForce FX GPU - http://developer.nvidia.com/object/nvshaderperf_home.html
OpenGL Performance Tips - For optimising application performance. - http://msdn.microsoft.com/library/default.asp?url=/library/en-us/opengl/apptips_1d9v.asp
glean - An open source benchmarking tool used to measure and compare the underlying hardware of OpenGL implementations. (MIT/X Consortium License) - http://glean.sourceforge.net/