This piece of software does nothing more than free and opensource alternatives, like 7-zip and peazip
LoL
I'm not here to decide which unzipping program is best, and I'm not even trying to make such choice. I mentioned some popular apps widely used by both Windows and Linux/OS X users. Whether you want to choose one or another is up to you and there will be nobody enforcing specific one to disappear from the list simply because it's worse, or better (in your opinion) than the other one.
Winrar is popular because people like you keep on spreading the word of it, 7-zip and peazip support many more archive types, have better compression, are open-source and free unlike winrar
And actually you didn't mentioned any BSD, Linux tool since 7-zip GUI isn't available natively on Linux, unlike peazip
I'm not here to decide which unzipping program is best, and I'm not even trying to make such choice.