the Openbox window manager.
"Most Linux-based distributions for the masses have either GNOME, KDE, or both desktops, yet the startup times and resources required by both GNOME and KDE make them unsuitable for old or lower-end hardware. My quest for a standards-compliant, fast, lightweight, and extensible window manager led me to Openbox.
Openbox complies with both the Inter-Client Communication Conventions Manual (ICCCM) and the Extended Window Manager Hints (EWMH). Originally derived from Blackbox, Openbox version 3 was completely rewritten in C. Among its fancy features, it supports chainable key bindings, customizable mouse actions, and multi-head Xinerama.
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