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Q2PRO
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Q2PRO is an enhanced Quake 2 engine for Windows and Linux. Q2PRO server is the first Quake 2 server to support multiview demo recording and live game broadcasting (aka GTV). Q2PRO client cares a lot about security (unlike other popular clients, it won't allow malicious or compromized server upload a crafted BSP or PAK file on your machine and then execute arbitrary code from it) and overall code sanity (unlike regular Quake 2, it won't load BSP files twice and waste memory, it will print an informative error message instead of crashing if some texture is found to be corrupted, etc etc). Other Q2PRO features include:

    optimized OpenGL renderer (much faster on integrated GPUs)
    enhanced console with Bash-style command completion
    fully asynchronous client (supports high cl_maxfps even with vsync on)
    ZIP packfiles (.pkz)
    JPG/PNG textures
    MD3 models
    HTTP downloads
    surround sound using OpenAL (follows regular Quake 2 linear distance model)
    forward and backward seeking in demos
    recording from demos
    variable server FPS

Q2PRO is no longer developed. The final version (r1093, released 30 May 2011) is still available for anyone interested. Documentation on Q2PRO-specific cvars and commands may be found in doc/ subdirectory inside the source tarball.