JOSM

Shortcuts:

1 drag to select; 3 drag to zoom;

M⇧l list of layers; M⇧p list of tags; M⇧t list of selection; M⇧r list of relations; M⇧f filter objects;

Ca select all; Cf search objects; ESC select none;

Cw toggle wireframe view; Cm merge layers (downwards layer-by-layer); C⇧m merge selection;

⇥ toggle sidebar;