Facebook SDKs enable you to pass app event data from your app to Facebook. With app event data, you can accurately track and measure the actions people take in your app.
Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
PayPal is a global eCommerce platform for buyers & sellers. PayPal allows payments & money transfers to be made securely via email, phone, text message or Skype.