Ask HN: Any Tech Nonprofits Interested in my Free Labor?

I'm looking for a tech nonprofit (US 501c3) that is interested in my programming skills. I will work full time (remotely) for 2 months in the summer for free. All I need is a little supervision and willingness to sign some forms (so I can get paid by external scholarship).

About me: CS Student (coursework: systems, data structures & algorithms, databases, PL).

Stack: Java, Android SDK, Python, C, SQL, Javascript, CSS, HTML. Learning: Django/Web dev

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I really don't know many tech nonprofits, so any leads would be appreciated! thanks.