Some plastic jugs and funnels are always handy,an oil filter wrench of some kind,greasegun,some copper grease to stop stuff seizing up,decent ratchet spanners if you can afford 'em,a multimeter,LED cordless inspection lamp,some ramps and axle stands,a oil syringe (like a bloody great cake icer,for sucking oil out of diffs and similar) and an oil change tray.Could go on for ever,but that and a good socket set,breaker bar and selection of screwdrivers of all head profiles should see you right.Some of that list are luxury items but do make the job easier.