HP has released an updated version of the Comware simulator Simware, no license or registration is required to use this tool.
The updated version includes a simple to use GUI and drag-and-drop connections between the devices. A limitation of the new version seems to be that chassis based devices can no longer be simulated.
UPDATE 20/08/15: The separation seems to be causing some confusion, this is the (currently available) direct download link for Simware, both 7.1.50 and 7.1.59 are listed here:
Product page which includes the download link:
Note: HP Inc and Hewlett Packard Enterprise are separating, so the download page currently seems to land on the HP Inc download site. Make sure to select the Hewlett Packard Enterprise link, which will take you to the proper download page.
Community support forum for the network simulator