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This is the GNS3 WorkBench project ("gns3workbench")
This project is hosted by SourceForge.net. The project team describes it as:
GNS3 WorkBench is a collection of approximately 50 Labs built for GNS3 running on a VMware image of Linux Mint. Many labs have variations and solutions, making approximately 140 different configuration sets (snapshots). You can download a VM appliance, or download a script that will take you through an install on your own copy of LInux. Or you can just grab the labs and add them to your Windows install of GNS3. Click on the [Files] Tab above to see the download options.
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