Well, why not? Here's what I've scrounged so far, from the manual, and from Arioch's post on Steam. Obviously, I'm not mentioning the obvious "left-click to select, right-click to do something" standards, and "click" means "left-click".
I have only included gameplay hotkeys, not those providing developer info.Anywhere:
alt+x: quit
Main (Strategic) Map:
Arrow keys or WASD or left-drag: pan map
Mouse wheel: zoom
Spacebar: Next Turn
Escape: exit current window, or bring up Game Menu if no window is displayed
Right-click notification icon: dismiss notification
Shift-click planet: move population
Right-click ship in the fleet pane: invert selected ships
With fleet selected: hold-right-click displays range of fleet
Shift-click Undo/Redo: Undo or Redo entire turn
Crtl-Shift-click Undo/Redo: Undo or Redo 10 turns
F1: Console
F10: Game Menu
Research screen:
Control-click: add item to end of research queue
Production queue:
Right-click: add item to queue, rather than as current build target
Shift-click ship: open Ship Designer for that class
B: Buy current production target
Ship Designer:
Shift-drag component: copy rather than move component
Tactical Combat:
arrow keys or WASD or left-drag: pan map
Mouse-wheel: zoom
Shift-click or shift-drag: Add or remove ships from current selection
Double-click ship: Select all ships of the same type
Right-click on weapon listing in the bottom pane: Disable autofire for this weapon