How to find a list of all apps on Google Play?

Question

Parsing

I do not understand how different sites find information about applications in Google Play. There was an idea to analyze different sections, but unfortunately I don’t understand how you can get to the lists of applications. Package code? It is textual, do not understand where to get everything. Some id? It's also not clear where to find them.
Maybe someone has already done this, tell me where to dig?