It's interesting how the X11 server is the only major category of infrastructure where we have one and only one open source implementation. With browsers -- which are massively complex nowadays -- at least we have both WebKit and Gecko. C++ compilers are at a similar level of complexity and there is GCC and Clang. Linux, FreeBSD, OpenBSD etc. are all separate kernels. But for X11 there is only the the X.Org server, t…
http://www.jcraft.com/weirdx/ - Pure Java X Window System Server under GPL They also had closed version http://www.jcraft.com/wiredx/ that supports antialiasing for core protocol (something X.org/XFree86 claimed to be impossible)
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