Free UserLAnd Alternatives
UserLAnd is described as 'provides the easiest way to run GNU/Linux Distros on Android.
Run full linux distros or specific applications on top of Android'. There are three alternatives to UserLAnd for various platforms. The best alternative is GNURoot Debian, which is both free and Open Source. Other great apps like UserLAnd are Another Term (Free, Open Source) and Andronix (Freemium, Open Source).