GNS3 2.0 has new features! In this video we discuss the new feature: Connect Qemu devices including IOSv, IOSvL2 and others while powered on.
Free software worth $200: https://goo.gl/613TUF
The stop symbol is now a square in order to help color-blind users to see the differences with running devices.
GNS3 Download: https://gns3.com/
GNS3 Support (Go here if you need help): https://gns3.com/community