I am running GNS3 - 2.2.29 in Hyper V Manager, I installed Windows 10 and Kali Linux VM in Hyper V Manager. I want to add windows 10 and Kali Linux host in GNS3 but no host option in GNS3. Could someone help me resolve this problem?
The supported appliance templates can be download from the following link.
For anything else, you can try to create your own template, like Kali. The one for BSD would give you a good starting point.