X11 — independent software & tools
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Havel
Havel is a scripting language for desktop automation: hotkeys, window control, input simulation, and game macros. Write concise scripts that run on X11 and Wayland
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libxslt
C XSLT library for GNOME
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open-sp
SGML parser
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twm
Tab Window Manager for X Window System
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xeyes
Follow the mouse X demo using the X SHAPE extension