VMWare Workstation was one of the greatest products of all time (in the early 2000s).  It made it possible for me to get a lot more work done on a single computer. At some point, VMWare the company shifted to enterprise VMs, absurdly overpriced, and VirtualBox could do everything VMWare could.  But for several years in the early 2000s, Workstation was a truly great product.