GNURoot Debian is described as 'provides a method for you to install and use Debian and its associated applications/packages alongside Android' and is a Virtualization App in the Network & Admin category. There are more than 10 alternatives to GNURoot Debian for a variety of platforms, including Windows, Linux, Android, Mac and Android Tablet. The best alternative is VirtualBox, which is both free and Open Source. Other great apps like GNURoot Debian are QEMU (Free, Open Source), VMware Workstation Pro (Paid), VMware Workstation Player (Free Personal) and Windows Sandbox (Free).
VMware Workstation Player builds on the industry leading foundation of Workstation Pro, and delivers a streamlined user interface for creating and running operating systems and applications in a virtual machine.
Portable-VirtualBox is a free and open source software tool that lets you run any operating system from a usb stick without separate installation. It unpacks and adjusts the paths and configuration of VirtualBox so it will run portably.
Limbo is an Intel x86 PC Emulator based on QEMU. You can now run DSL Linux and apps like terminal, ssh, X Server, ftp, vnc, samba, vpn, mysql clients, gcc, java, perl, python right on your Android device.
UserLAnd provides the easiest way to run GNU/Linux Distros on Android. Features: Run full linux distros or specific applications on top of Android. Install and uninstall like a regular app. No root required.