As the only real 'airline home lounge' in Gothenburg, the Gothenburg SAS Scandinavian lounge is fully equipped, and better than you might expect.
Despite the lounge being quite small, there is an excellent view of the airfield, two separate lounge areas with comfortable seats, a self service buffet and a good bar, which is self service. Wifi is fast, there are special work desks, and even a couple of dedicated offices, plus a children's play area.