zlacker

I used Bluestacks to play Android games on Windows, which was quite nice.

But I don't know if a full emulator is a good idea on a smartphone.

>>k__+(OP)
It's a Linux container, so no emulation there - but it's still a fully separate user space that communicates with the rest of the system via a bridge in the same way a virtual machine does.

There's also Waydroid, which works by implementing things like Wayland/PulseAudio clients directly inside Android compositor/sound system, but I haven't ran it on the Librem 5 yet (I know that some people are using it on the PinePhone).

>>k__+(OP)
Anbox is similar to Docker, not a VM. It uses the host Linux kernel, just running the Android userspace in a namespace.