LXOSD is an on-screen display (OSD)/overlay for OpenGL applications running on Linux with X11.
Free
Open Source
Linux
GLXOSD is an onscreen display (OSD)/overlay for OpenGL applications running on Linux with X11. It can show FPS, the temperature of your CPU, and if you have an NVIDIA graphics card (with proprietary drivers), it will also show the temperature of the GPU. Also, it can log frame timings, which is useful for benchmarking.
RivaTuner is a complete powerful tweaking environment, providing you everything you may need to tune NVIDIA GPU based display adapters.
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