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FVWM3 vs Openbox: catalog facts
FVWM3	Openbox
Best for: X11 users who want a lightweight window manager they can shape completely	Best for: Manage X11 windows with a configurable stacking window manager
Free Free, with source code published on GitHub.	Free Free and open source. Hosting, hardware and any external services are separate.
Linux	Linux
Extremely configurable behaviour and appearance Multi-monitor support through RandR All 4 strengths for FVWM3 Extremely configurable behaviour and appearance Multi-monitor support through RandR Lightweight, with a long history and active development Includes a default configuration to start from	Supports custom menus and window rules Can be used alone or within another desktop setup
X11 only, no Wayland support Configuration has a steep learning curve	A complete desktop requires separate panels, launchers and other utilities.
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Offline features available	Not stated if it works offline
Official website Full listing and sources Sources for FVWM3 github.com/fvwmorg/fvwm3 Catalog checked September 24, 2026	Official website Full listing and sources Sources for Openbox openbox.org Catalog checked September 22, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.