GNS3 now has a openSUSE QEMU Linnux appliance. Add openSUSE, Ubuntu and many other types of Linux appliances to your GNS3 topologies. Linux = choice. GNS3 = choice. Use what you like :)
openSUSE is a free and Linux-based operating system for PC, Laptop or Server. The openSUSE project is a community program sponsored by Novell. It is a general purpose operating system built on top of the Linux kernel, developed by the community-supported openSUSE Project and sponsored by SUSE and a number of other companies.
...
https://www.youtube.com/watch?v=psf7jVmq6B8