Many proposals for Basic Income set the rate too high. A reasonable amount would not overly disincentivize people from working. So in your case, yes, you could

Many proposals for Basic Income set the rate too high. A reasonable amount would not overly disincentivize people from working. So in your case, yes, you could spend much more of your time doing open source development, but it is likely you will still want to some commercial work so you can have bit more than just the bare necessities.