For those who'd like to run Windows software without (a) investing in/installing Parallels or another virtual OS manager or (b) investing in Windows, Crossover is an impressively competent solution. It doesn't run everything, but it does run an awful lot of standard Windows software. And it's currently on sale:

https://stacksocial.com/sales/crossover-13-run-windows-software-on-your-mac

There's a compatibility database that rates applications by how Crossover-compatible they are:

http://www.codeweavers.com/compatibility/search/