Facebook Login API allows users to register or sign in to your app with their Facebook identity.
Using the Google Photos Library API your app can read, write, and share photos and videos in Google Photos.
The API has been made by the openclipart.org. Website gives access to the clipart library with unlimited commercial use of the content.
If you are going to build e-commerce solutions in Poland the Apaczka webservice API integration is what you are looking for...
By creating systems in jPALIO™, we often create tools that can be the ready to run applications...