But see also EquipmentWanted.
Hand tools - screw drivers (precision, flat and Phillips), side cutters, pliers, hex keys.
Power tools - drill press, hand drill.
Electronics - a soldering iron, multi-meters, electronic part bins, assorted components.
Test gear - a very nice vintage oscilloscope.
A 500GB NAS box for file storage.
3D printing - A Reprap Mendel-style 3DPrinter with a 0.5mm nozzle and heated bed for printing with 3mm ABS filament.