VMWare Fusion is a Mac virtualisation solution by VMWare, a long-established virtualization company on the Windows side. It entered that Mac market a little late, but has been gaining ground ever since.
VMWare is almost a feature-for-feature match with Parallels, price and access to Boot Camp partition included. OU Students are divided in their choice of favourite, as each does the job very well. So you have a choice of two very good solutions.