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Minimalistic Xlib toolkit.

https://github.com/meh/ruby-x11 (gem, FFI, WM)
https://github.com/ayanko/x11_client (gem, C ext)
https://github.com/frankhale/ruby-window-management (C ext, WM)
https://github.com/christopheraue/ruby-xlib (gem, FFI)
https://github.com/rkh/ruby-xlib (C ext)
https://github.com/rramsden/ruby-x11 (pure ruby)
http://ruby-xlib-wrap.sourceforge.net/ (ext, SWIG)
http://www.moriq.com/ruby/xlib/
http://artengine.ca/matju/RubyX11/
https://github.com/mhanne/ruby-xcb (XCB, FFI)