Ask HN: Finding nonprofits that need help

I want to volunteer some of my time as a Web developer to a nonprofit that helps kids. Is there a place you've found that connects volunteers and nonprofit organizations? I tried a couple of places, but never received a response.

I'd really like to find a smaller organization that is helping kids.

I have over 15 years experience as a developer and have worked for companies such as Motorola Solutions, Airbus Defense and Space and NAPA Auto Parts. So, if you know of anyone looking for help, let me know!