If none of that applies, and you still want to learn something to do with tech? Well, you know this won't be an ideal situation to engage directly with a system. How about zooming out a bit? Read some books. Some of Stallman's essays. Clifford Stoll. Or anything else more recent that you think is big-picture significant to your field. Your situation will be ideal for contemplation, which will in the long-term make you a better contributor to whatever projects you take on.