Frontends
Recently, there has been a rise in the popularity of frontends, specially for Android devices.
These are applications that provide a unified interface for managing and launching your games across multiple emulators.
Here are the most popular ones:
Most of the time, they replace your device's default launcher, and provide a more console-like experience, with features like game metadata, box art, and more.
Metadata and box art are usually fetched from such onlines databases (which requires some setup and configuration) :