It seems that GNS3, VIRL and Cisco Packet Tracer are the most popular options but the following article listed some other alternatives from Cisco including CCIE Lab Builder, CML, onePK (now EOL) and the Cisco CSR 1000V. (Virtual Networking Labs Showdown | Sean Evershed | LinkedIn) Has anyone had any experience with these or other options, and if so- what were your impressions?
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