Hi,
you can use the EXOS VM and GNS3 to emulate networks. That is not exactly like Cisco's Packet Tracer simulation software, but similar. Since the EXOS VM is using the real switch operating system, this solution supports more features than the quite restricted Packet Tracer. By the way, GNS3 supports Cisco routers as well.
See
Setting up GNS3 with EXOS-VM.
Thanks,
Erik