OkHttp-Stats is an android library built on top of OkHttp3, which is responsible for intercepting all the network calls and for calculating network stats such as the average network speed of the user.
This is more of an analytical tool which can be used to track the success and error response logs.
Can be plugged in to any app which uses okhttp in their networking stack.
Android Http Client is a small library to make requests to any internet service simple and practical way. You can implement multiple interfaces for the management of the responses. It also includes interfaces for managing upload and download of files.
Pacman is a lightweight and easy to use Parallel API Calls Manager.
You might need to execute multiple API calls at once to speed up loading of your app and proceed only when you have the data from all the required API calls. Managing this using normal boolean flags or such methods can be a pain and can result to incorrect data or behaviour.
That is where Pacman comes to play, as you just set it up with some CallGroup, make the API calls and then update Pacman as and when you get a response from the call.
After all the calls are done processing, Pacman will fire a callback to an attached listener (which you have set up) and then you have do whatever processing you needed to do after the calls were done.