The OpenAddresses R SDK by Scott Chamberlain is an R client for data from OpenAddresses. The library serves to make it easy to retrieve the data, as well as combine data sets and visualization. OpenAddresses is a web portal for the management of Open Source worldwide localized postal addresses.
Almost every app that uses a mapping API needs latitude/longitude points. To get geocodes you need to convert an address to a point on the earth. That's where you'll need one of the 54 geocoding APIs in our directory. This post covers seven free geocoders and compares them on several aspects.
For several years millions have shared the places they've been using the Where I've Been website and Facebook application. The site also has an API (our Where I've Been API profile), which allows for much of the same functionality, such as searching countries, marking it visited and adding content such as a story or photo.