Back in April, Google introduced One Today, an Android app that allows users to easily donate $1 to various nonprofit organizations. At the time, the app was being piloted on an invite-only basis, but availability has now opened up to all Android users in the United States. A different charitable cause is profiled each day, and if you like what you see, contributing $1 from your Google Wallet account is as easy as tapping a button. If you're particularly passionate about a given nonprofit, you can also opt to match donations of your friends — a tactic Google hopes will persuade more users to hit the donate button. A summary of each nonprofit organization is provided, along with a general overview of how your money will help make a difference. You can download One Today at no cost from the source below.