Ask HN: What are some useful information APIs for a physical security app?

Hi everyone, We are building an open source mobile app to help manage the physical security of human rights defenders, aid workers and journalists. We want to pull as much relevant security content for these often vulnerable people together as possible. So we are looking to see what useful APIs are out there that we can use. Already we have looked at travel, weather, media, embassy warnings. Does anyone know any others might be useful and are available? Many thanks! :) Security First www.secfirst.org