Google's open source web app, Person Finder, has been launched again, this time in the wake of Typhoon Yolanda, which has caused untold devastation in the Phillippines already. The application, which was previously brought out during the Boston Marathon Tragedy and Hurricane Sandy, was created by Google engineers following the 2010 Haiti earthquake. It trawls the web to gather data from sites that collect info about missing persons, then lets you input the name of someone you're looking for, or someone you have information about. The Finder is also available via mobile, so you can request information via SMS.
Google's Yolanda crisis page also includes other tools, including ways to make a donation or help and relief map.