CAMERA:

WASD - Move

Space/Left Shift - Move Up / Down

T - Enable/Disable camera movement

Left Click / Arrow Keys - Orbit

Right Click - Pan

F - Center on selected object

Q/E - Snap to cardinal directions

R - Reset Camera

O - Toggle Outlines

TRANSFORM:

Drag axes to move objects

Hold CTRL to move objects more precisely (0.1 increments)

Left Click / Tab - Select object

CTRL + Left Click - Add object to Group

CTRL + Left Click Drag - Add objects in box to Group

G - Select ALL objects

Del - Delete selected objects

C - Duplicate selected objects

Z/X - Undo/Redo

B - Toggle between translation and rotation (only with groups)

Equals/Minus - Increase/Decrease size of all selected spheres by factor of 1.5 (WARNING: Decreasing the size can introduce warping to the model due to rounding)

IMPORT/EXPORT:

Use the buttons on the top right to Import/Export