Emulating a full desktop computer on your device and installing several operating systems (FreeDOS, Windows, KolibriOS, multiple GNU/Linux versions, and any other x86-compatible OS), you can live in limbo.
Change RAM, the amount of emulated cores, the type of CPU, mount hard-drive and CD-ROM images, pick emulated graphics, network, and audio card types with Limbo.
F-Droid serves com.coboltforge.dontmind.multivnc, Android, and com.coboltforge.dontmind.multivnc clients allowing access to the simulated desktop inside of limbo.
Limbo can operate in KVM mode on Android devices with x86-based CPUs (Intel Atom), hence enhancing performance.
Given that limbo replics another CPU architecture, you most likely won't be able to run contemporary operating systems with respectable speed.