You can start with http://foodfuel.blogspot.com that is doing a fundraiser for three coastal communities in Leogane, Grand-Goave, and Petit-Goave.
Donate whatever amount you want to
Another great organization I will refer you to is http://christianfriendshipministries.org. It has a superb US-based board of directors who are reaching out to the needy ones in Northern Haiti, especially Pignon. CFM leaders are thinking about reaching out to the victims of Matthew in the southern part of Haiti. You can eventually travel with their teams or contribute to their current relief project. The more funds they can collect, the faster they can go. They have lots of experience of traveling to Haiti, mostly in the North. We know that they will go wherever the needs take them. So be part of their next team!