BillionGraves is a free, searchable website for cemeteries and gravestones worldwide. They have a smartphone app so users can take photos of gravestones and upload and/or transcribe information from the photos to the BillionGraves website.
“Our goal is to preserve precious records found in cemeteries throughout the world. We use modern technology to capture images of headstones with their GPS locations so users worldwide can access those records anywhere. BillionGraves strives to do just that: preserve at least one billion graves.”
Records search is free and you can pay for features such as “Record Watch” which is an alert when your specific research terms come online. You can earn some features through participation in the BillionGraves project by uploading and transcribing photos.