Lavaman

Lavaman is a "live tile" dashboard you assemble from slices of any window or monitor.

Click Add Region and drag a rectangle over any part of any monitor, and that slice becomes a live pane. A single render-synced capture loop shared across all panes drives mirroring at 15, 30 or 60 fps.

Regions are stored in physical-pixel virtual-desktop coordinates, so captures stay sharp under per-monitor DPI scaling. Layouts persist between sessions.