These tools can be used to compile and package the Xposed framework. They are especially useful when it comes to releasing files for various platforms and Android versions. Note that Xposed by itself is quite complicated and not suitable for beginners. You'll need a certain level of experience with C++ and general software development in order to build and modify Xposed by yourself. Xposed is open-source and contributions are very welcome. The files in this repository hopefully make it easier to compile custom versions for testing and improvements. However, please be careful when you publish your own versions. Make clear that it's an unofficial version to avoid confusion, and also remember to give proper attribution. Your version probably still includes 99% or more of the original source code that has been written since 2012, so it wouldn't be fair to make it sound like you did all the work. Also, if you made some fixes or improvements, it's in everyone's interest that you create a pull request and contribute them back to the original project.