VOGL  VOGL is a debugger for the OpenGL rendering API intended to be used in the development of video games. VOGL was originally written at RAD Game Tools and Valve. VOGL is free and open-source software subject to the terms of the MIT License. There is a graphical front-end implementing Qt5-based GUI widgets. VOGL was initially released with support for Linux operating systems only, but on April 23, 2014, additional support for Microsoft Windows was released. Goals included:  VOGLperf is a benchmarking tool for Linux OpenGL games.