Don't know what you mean by parallel's but virtual box a window's PC and run it there.
Without having to download Parallels. Just a straight up Sentry for Macs.
There are a few programs to run exe on mac.
It's not exactly the same as Sentry MBA, but if you're looking to crack accounts using http(s) requests then you should check out hydra. If you have brew installed, you can install hydra by opening a terminal window and typing: brew install hydra
- - - Updated - - -
You could try Wine.
BlueCow