Unreal Engine

Development Tools
Viewport Tools
W Move (Translate) gizmo Win mac Linux
E Rotate gizmo Win mac Linux
R Scale gizmo Win mac Linux
F Focus / frame selected actor Win mac Linux
G Toggle game view mode Win mac Linux
H Toggle visibility of selected actor Win mac Linux
END Snap actor to floor Win mac Linux
Actors
CTRL+D Duplicate selected actor Win Linux
+D Duplicate selected actor mac
DEL Delete selected actor Win mac Linux
CTRL+A Select all actors Win Linux
+A Select all actors mac
Play in Editor
ALT+P Play in viewport Win mac Linux
ESC Stop Play in Editor Win mac Linux
General
CTRL+Z Undo Win Linux
+Z Undo mac
CTRL+Y Redo Win Linux
+⇧ Shift+Z Redo mac
CTRL+S Save current level Win Linux
+S Save current level mac
CTRL+⇧ Shift+S Save all Win Linux
+⇧ Shift+S Save all mac