Are there free versions of VMware?

Yes!  The product is called VMWARE Player.  (But many useful features of Workstation Pro are missing!  It is recommended that the Workstation License be purchased.)  More information about Workstation Player is at:

https://www.vmware.com/content/vmware/vmware-published-sites/us/products/workstation-player.html.html

or for the MAC:

https://www.vmware.com/products/fusion.html Select Free License Version.

Is this available on LINUX?

Yes!  Follow appropriate links on VMWARE website:

https://www.vmware.com