Google Grants is the nonprofit edition of AdWords, Google’s online advertising tool. Google Grants empowers nonprofit organizations, through $10,000 per month in in-kind AdWords™ advertising, to promote their missions and initiatives on Google.com. Every nonprofit has unique goals. Whether you are trying to build awareness, recruit volunteers, or increase donations, Ad Grants can help you utilize AdWords to captivate your audience and tell your story.
More information is available here.
Source: Google for Nonprofits